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Finding the Fourth Proportional to 981.90, 1,355.06 and 539.84

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Solution

The fourth proportional to 981.90, 1,355.06 and 539.84 is: 744.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.90 : 1,355.06 = 539.84 : x
  2. Step 2: Convert to fraction form
    981.90/1,355.06 = 539.84/x
  3. Step 3: Cross multiply
    981.90x = 1,355.06 × 539.84
  4. Step 4: Simplify right side
    981.90x = 731,506.12
  5. Step 5: Solve for x
    x = 731,506.12/981.90
  6. Step 6: Final answer
    x = 744.99

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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.