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Finding the Fourth Proportional to 709.43, 979.92 and 545.65

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Solution

The fourth proportional to 709.43, 979.92 and 545.65 is: 753.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.43 : 979.92 = 545.65 : x
  2. Step 2: Convert to fraction form
    709.43/979.92 = 545.65/x
  3. Step 3: Cross multiply
    709.43x = 979.92 × 545.65
  4. Step 4: Simplify right side
    709.43x = 534,693.35
  5. Step 5: Solve for x
    x = 534,693.35/709.43
  6. Step 6: Final answer
    x = 753.69

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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.