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Finding the Fourth Proportional to 748.79, 1,123.15 and 261.95

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Solution

The fourth proportional to 748.79, 1,123.15 and 261.95 is: 392.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.79 : 1,123.15 = 261.95 : x
  2. Step 2: Convert to fraction form
    748.79/1,123.15 = 261.95/x
  3. Step 3: Cross multiply
    748.79x = 1,123.15 × 261.95
  4. Step 4: Simplify right side
    748.79x = 294,209.14
  5. Step 5: Solve for x
    x = 294,209.14/748.79
  6. Step 6: Final answer
    x = 392.91

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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.