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Finding the Fourth Proportional to 693.20, 1,039.80 and 614.90

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Solution

The fourth proportional to 693.20, 1,039.80 and 614.90 is: 922.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.20 : 1,039.80 = 614.90 : x
  2. Step 2: Convert to fraction form
    693.20/1,039.80 = 614.90/x
  3. Step 3: Cross multiply
    693.20x = 1,039.80 × 614.90
  4. Step 4: Simplify right side
    693.20x = 639,373.02
  5. Step 5: Solve for x
    x = 639,373.02/693.20
  6. Step 6: Final answer
    x = 922.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.