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Finding the Fourth Proportional to 664,679.40, 997,019.10 and 221,447.40

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Solution

The fourth proportional to 664,679.40, 997,019.10 and 221,447.40 is: 332,171.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,679.40 : 997,019.10 = 221,447.40 : x
  2. Step 2: Convert to fraction form
    664,679.40/997,019.10 = 221,447.40/x
  3. Step 3: Cross multiply
    664,679.40x = 997,019.10 × 221,447.40
  4. Step 4: Simplify right side
    664,679.40x = 220,787,287,445.34
  5. Step 5: Solve for x
    x = 220,787,287,445.34/664,679.40
  6. Step 6: Final answer
    x = 332,171.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.