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Finding the Fourth Proportional to 818.38, 1,129.56 and 469.27

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Solution

The fourth proportional to 818.38, 1,129.56 and 469.27 is: 647.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.38 : 1,129.56 = 469.27 : x
  2. Step 2: Convert to fraction form
    818.38/1,129.56 = 469.27/x
  3. Step 3: Cross multiply
    818.38x = 1,129.56 × 469.27
  4. Step 4: Simplify right side
    818.38x = 530,068.62
  5. Step 5: Solve for x
    x = 530,068.62/818.38
  6. Step 6: Final answer
    x = 647.70

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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.