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Finding the Fourth Proportional to 1,187.28, 1,781.14 and 529.40

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Solution

The fourth proportional to 1,187.28, 1,781.14 and 529.40 is: 794.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.28 : 1,781.14 = 529.40 : x
  2. Step 2: Convert to fraction form
    1,187.28/1,781.14 = 529.40/x
  3. Step 3: Cross multiply
    1,187.28x = 1,781.14 × 529.40
  4. Step 4: Simplify right side
    1,187.28x = 942,935.52
  5. Step 5: Solve for x
    x = 942,935.52/1,187.28
  6. Step 6: Final answer
    x = 794.20

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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.