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Finding the Fourth Proportional to 709.92, 1,065.93 and 613.18

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Solution

The fourth proportional to 709.92, 1,065.93 and 613.18 is: 920.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.92 : 1,065.93 = 613.18 : x
  2. Step 2: Convert to fraction form
    709.92/1,065.93 = 613.18/x
  3. Step 3: Cross multiply
    709.92x = 1,065.93 × 613.18
  4. Step 4: Simplify right side
    709.92x = 653,606.96
  5. Step 5: Solve for x
    x = 653,606.96/709.92
  6. Step 6: Final answer
    x = 920.68

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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.