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Finding the Fourth Proportional to 818.60, 1,129.92 and 709.24

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Solution

The fourth proportional to 818.60, 1,129.92 and 709.24 is: 978.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.60 : 1,129.92 = 709.24 : x
  2. Step 2: Convert to fraction form
    818.60/1,129.92 = 709.24/x
  3. Step 3: Cross multiply
    818.60x = 1,129.92 × 709.24
  4. Step 4: Simplify right side
    818.60x = 801,384.46
  5. Step 5: Solve for x
    x = 801,384.46/818.60
  6. Step 6: Final answer
    x = 978.97

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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.