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Finding the Fourth Proportional to 2,171.72, 3,258.14 and 766.49

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Solution

The fourth proportional to 2,171.72, 3,258.14 and 766.49 is: 1,149.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.72 : 3,258.14 = 766.49 : x
  2. Step 2: Convert to fraction form
    2,171.72/3,258.14 = 766.49/x
  3. Step 3: Cross multiply
    2,171.72x = 3,258.14 × 766.49
  4. Step 4: Simplify right side
    2,171.72x = 2,497,311.61
  5. Step 5: Solve for x
    x = 2,497,311.61/2,171.72
  6. Step 6: Final answer
    x = 1,149.93

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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.