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Finding the Fourth Proportional to 749.93, 1,034.21 and 487.85

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Solution

The fourth proportional to 749.93, 1,034.21 and 487.85 is: 672.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.93 : 1,034.21 = 487.85 : x
  2. Step 2: Convert to fraction form
    749.93/1,034.21 = 487.85/x
  3. Step 3: Cross multiply
    749.93x = 1,034.21 × 487.85
  4. Step 4: Simplify right side
    749.93x = 504,536.91
  5. Step 5: Solve for x
    x = 504,536.91/749.93
  6. Step 6: Final answer
    x = 672.78

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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.