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Finding the Fourth Proportional to 664,638.40, 996,957.60 and 221,406.40

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Solution

The fourth proportional to 664,638.40, 996,957.60 and 221,406.40 is: 332,109.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,638.40 : 996,957.60 = 221,406.40 : x
  2. Step 2: Convert to fraction form
    664,638.40/996,957.60 = 221,406.40/x
  3. Step 3: Cross multiply
    664,638.40x = 996,957.60 × 221,406.40
  4. Step 4: Simplify right side
    664,638.40x = 220,732,793,168.64
  5. Step 5: Solve for x
    x = 220,732,793,168.64/664,638.40
  6. Step 6: Final answer
    x = 332,109.60

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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.