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Finding the Fourth Proportional to 981.86, 1,355.05 and 539.85

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Solution

The fourth proportional to 981.86, 1,355.05 and 539.85 is: 745.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.86 : 1,355.05 = 539.85 : x
  2. Step 2: Convert to fraction form
    981.86/1,355.05 = 539.85/x
  3. Step 3: Cross multiply
    981.86x = 1,355.05 × 539.85
  4. Step 4: Simplify right side
    981.86x = 731,523.74
  5. Step 5: Solve for x
    x = 731,523.74/981.86
  6. Step 6: Final answer
    x = 745.04

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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.