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Finding the Fourth Proportional to 818.32, 1,129.46 and 538.58

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Solution

The fourth proportional to 818.32, 1,129.46 and 538.58 is: 743.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.32 : 1,129.46 = 538.58 : x
  2. Step 2: Convert to fraction form
    818.32/1,129.46 = 538.58/x
  3. Step 3: Cross multiply
    818.32x = 1,129.46 × 538.58
  4. Step 4: Simplify right side
    818.32x = 608,304.57
  5. Step 5: Solve for x
    x = 608,304.57/818.32
  6. Step 6: Final answer
    x = 743.36

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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.