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Finding the Fourth Proportional to 818.62, 1,129.84 and 487.24

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Solution

The fourth proportional to 818.62, 1,129.84 and 487.24 is: 672.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.62 : 1,129.84 = 487.24 : x
  2. Step 2: Convert to fraction form
    818.62/1,129.84 = 487.24/x
  3. Step 3: Cross multiply
    818.62x = 1,129.84 × 487.24
  4. Step 4: Simplify right side
    818.62x = 550,503.24
  5. Step 5: Solve for x
    x = 550,503.24/818.62
  6. Step 6: Final answer
    x = 672.48

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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.