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Finding the Fourth Proportional to 1,187.19, 1,781.28 and 456.62

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Solution

The fourth proportional to 1,187.19, 1,781.28 and 456.62 is: 685.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.19 : 1,781.28 = 456.62 : x
  2. Step 2: Convert to fraction form
    1,187.19/1,781.28 = 456.62/x
  3. Step 3: Cross multiply
    1,187.19x = 1,781.28 × 456.62
  4. Step 4: Simplify right side
    1,187.19x = 813,359.17
  5. Step 5: Solve for x
    x = 813,359.17/1,187.19
  6. Step 6: Final answer
    x = 685.11

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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.