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Finding the Fourth Proportional to 1,187.56, 1,781.61 and 457.18

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Solution

The fourth proportional to 1,187.56, 1,781.61 and 457.18 is: 685.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.56 : 1,781.61 = 457.18 : x
  2. Step 2: Convert to fraction form
    1,187.56/1,781.61 = 457.18/x
  3. Step 3: Cross multiply
    1,187.56x = 1,781.61 × 457.18
  4. Step 4: Simplify right side
    1,187.56x = 814,516.46
  5. Step 5: Solve for x
    x = 814,516.46/1,187.56
  6. Step 6: Final answer
    x = 685.87

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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.