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Finding the Fourth Proportional to 749.20, 1,033.57 and 487.24

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Solution

The fourth proportional to 749.20, 1,033.57 and 487.24 is: 672.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.20 : 1,033.57 = 487.24 : x
  2. Step 2: Convert to fraction form
    749.20/1,033.57 = 487.24/x
  3. Step 3: Cross multiply
    749.20x = 1,033.57 × 487.24
  4. Step 4: Simplify right side
    749.20x = 503,589.04
  5. Step 5: Solve for x
    x = 503,589.04/749.20
  6. Step 6: Final answer
    x = 672.17

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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.