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Finding the Fourth Proportional to 1,240.38, 1,711.80 and 709.29

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Solution

The fourth proportional to 1,240.38, 1,711.80 and 709.29 is: 978.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.38 : 1,711.80 = 709.29 : x
  2. Step 2: Convert to fraction form
    1,240.38/1,711.80 = 709.29/x
  3. Step 3: Cross multiply
    1,240.38x = 1,711.80 × 709.29
  4. Step 4: Simplify right side
    1,240.38x = 1,214,162.62
  5. Step 5: Solve for x
    x = 1,214,162.62/1,240.38
  6. Step 6: Final answer
    x = 978.86

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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.