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Finding the Fourth Proportional to 750.74, 1,125.96 and 311.90

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Solution

The fourth proportional to 750.74, 1,125.96 and 311.90 is: 467.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.74 : 1,125.96 = 311.90 : x
  2. Step 2: Convert to fraction form
    750.74/1,125.96 = 311.90/x
  3. Step 3: Cross multiply
    750.74x = 1,125.96 × 311.90
  4. Step 4: Simplify right side
    750.74x = 351,186.92
  5. Step 5: Solve for x
    x = 351,186.92/750.74
  6. Step 6: Final answer
    x = 467.79

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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.