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Finding the Fourth Proportional to 818.47, 1,129.17 and 539.20

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Solution

The fourth proportional to 818.47, 1,129.17 and 539.20 is: 743.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.47 : 1,129.17 = 539.20 : x
  2. Step 2: Convert to fraction form
    818.47/1,129.17 = 539.20/x
  3. Step 3: Cross multiply
    818.47x = 1,129.17 × 539.20
  4. Step 4: Simplify right side
    818.47x = 608,848.46
  5. Step 5: Solve for x
    x = 608,848.46/818.47
  6. Step 6: Final answer
    x = 743.89

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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.