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Finding the Fourth Proportional to 818.20, 1,129.53 and 538.84

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Solution

The fourth proportional to 818.20, 1,129.53 and 538.84 is: 743.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.20 : 1,129.53 = 538.84 : x
  2. Step 2: Convert to fraction form
    818.20/1,129.53 = 538.84/x
  3. Step 3: Cross multiply
    818.20x = 1,129.53 × 538.84
  4. Step 4: Simplify right side
    818.20x = 608,635.95
  5. Step 5: Solve for x
    x = 608,635.95/818.20
  6. Step 6: Final answer
    x = 743.87

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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.