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Finding the Fourth Proportional to 749.13, 1,123.29 and 255.39

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Solution

The fourth proportional to 749.13, 1,123.29 and 255.39 is: 382.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.13 : 1,123.29 = 255.39 : x
  2. Step 2: Convert to fraction form
    749.13/1,123.29 = 255.39/x
  3. Step 3: Cross multiply
    749.13x = 1,123.29 × 255.39
  4. Step 4: Simplify right side
    749.13x = 286,877.03
  5. Step 5: Solve for x
    x = 286,877.03/749.13
  6. Step 6: Final answer
    x = 382.95

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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.