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Finding the Fourth Proportional to 987.27, 1,362.36 and 539.13

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Solution

The fourth proportional to 987.27, 1,362.36 and 539.13 is: 743.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.27 : 1,362.36 = 539.13 : x
  2. Step 2: Convert to fraction form
    987.27/1,362.36 = 539.13/x
  3. Step 3: Cross multiply
    987.27x = 1,362.36 × 539.13
  4. Step 4: Simplify right side
    987.27x = 734,489.15
  5. Step 5: Solve for x
    x = 734,489.15/987.27
  6. Step 6: Final answer
    x = 743.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.