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Finding the Fourth Proportional to 749.10, 1,121.79 and 423.84

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Solution

The fourth proportional to 749.10, 1,121.79 and 423.84 is: 634.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.10 : 1,121.79 = 423.84 : x
  2. Step 2: Convert to fraction form
    749.10/1,121.79 = 423.84/x
  3. Step 3: Cross multiply
    749.10x = 1,121.79 × 423.84
  4. Step 4: Simplify right side
    749.10x = 475,459.47
  5. Step 5: Solve for x
    x = 475,459.47/749.10
  6. Step 6: Final answer
    x = 634.71

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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.