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Finding the Fourth Proportional to 915.52, 1,263.51 and 542.56

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Solution

The fourth proportional to 915.52, 1,263.51 and 542.56 is: 748.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.52 : 1,263.51 = 542.56 : x
  2. Step 2: Convert to fraction form
    915.52/1,263.51 = 542.56/x
  3. Step 3: Cross multiply
    915.52x = 1,263.51 × 542.56
  4. Step 4: Simplify right side
    915.52x = 685,529.99
  5. Step 5: Solve for x
    x = 685,529.99/915.52
  6. Step 6: Final answer
    x = 748.79

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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.