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Finding the Fourth Proportional to 749.51, 1,123.89 and 378.92

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Solution

The fourth proportional to 749.51, 1,123.89 and 378.92 is: 568.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.51 : 1,123.89 = 378.92 : x
  2. Step 2: Convert to fraction form
    749.51/1,123.89 = 378.92/x
  3. Step 3: Cross multiply
    749.51x = 1,123.89 × 378.92
  4. Step 4: Simplify right side
    749.51x = 425,864.40
  5. Step 5: Solve for x
    x = 425,864.40/749.51
  6. Step 6: Final answer
    x = 568.19

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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.