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Finding the Fourth Proportional to 709.86, 979.74 and 531.31

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Solution

The fourth proportional to 709.86, 979.74 and 531.31 is: 733.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.86 : 979.74 = 531.31 : x
  2. Step 2: Convert to fraction form
    709.86/979.74 = 531.31/x
  3. Step 3: Cross multiply
    709.86x = 979.74 × 531.31
  4. Step 4: Simplify right side
    709.86x = 520,545.66
  5. Step 5: Solve for x
    x = 520,545.66/709.86
  6. Step 6: Final answer
    x = 733.31

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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.