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Finding the Fourth Proportional to 981.60, 1,354.61 and 539.50

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Solution

The fourth proportional to 981.60, 1,354.61 and 539.50 is: 744.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.60 : 1,354.61 = 539.50 : x
  2. Step 2: Convert to fraction form
    981.60/1,354.61 = 539.50/x
  3. Step 3: Cross multiply
    981.60x = 1,354.61 × 539.50
  4. Step 4: Simplify right side
    981.60x = 730,813.37
  5. Step 5: Solve for x
    x = 730,813.37/981.60
  6. Step 6: Final answer
    x = 744.51

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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.