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Finding the Fourth Proportional to 754.39, 1,130.78 and 315.53

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Solution

The fourth proportional to 754.39, 1,130.78 and 315.53 is: 472.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.39 : 1,130.78 = 315.53 : x
  2. Step 2: Convert to fraction form
    754.39/1,130.78 = 315.53/x
  3. Step 3: Cross multiply
    754.39x = 1,130.78 × 315.53
  4. Step 4: Simplify right side
    754.39x = 356,790.61
  5. Step 5: Solve for x
    x = 356,790.61/754.39
  6. Step 6: Final answer
    x = 472.95

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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.