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Finding the Fourth Proportional to 981.92, 1,355.14 and 539.91

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Solution

The fourth proportional to 981.92, 1,355.14 and 539.91 is: 745.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.92 : 1,355.14 = 539.91 : x
  2. Step 2: Convert to fraction form
    981.92/1,355.14 = 539.91/x
  3. Step 3: Cross multiply
    981.92x = 1,355.14 × 539.91
  4. Step 4: Simplify right side
    981.92x = 731,652.29
  5. Step 5: Solve for x
    x = 731,652.29/981.92
  6. Step 6: Final answer
    x = 745.12

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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.