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Finding the Fourth Proportional to 818.68, 1,129.94 and 487.04

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Solution

The fourth proportional to 818.68, 1,129.94 and 487.04 is: 672.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.68 : 1,129.94 = 487.04 : x
  2. Step 2: Convert to fraction form
    818.68/1,129.94 = 487.04/x
  3. Step 3: Cross multiply
    818.68x = 1,129.94 × 487.04
  4. Step 4: Simplify right side
    818.68x = 550,325.98
  5. Step 5: Solve for x
    x = 550,325.98/818.68
  6. Step 6: Final answer
    x = 672.21

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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.