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Finding the Fourth Proportional to 754.67, 1,130.49 and 479.78

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Solution

The fourth proportional to 754.67, 1,130.49 and 479.78 is: 718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.67 : 1,130.49 = 479.78 : x
  2. Step 2: Convert to fraction form
    754.67/1,130.49 = 479.78/x
  3. Step 3: Cross multiply
    754.67x = 1,130.49 × 479.78
  4. Step 4: Simplify right side
    754.67x = 542,381.47
  5. Step 5: Solve for x
    x = 542,381.47/754.67
  6. Step 6: Final answer
    x = 718.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.