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Finding the Fourth Proportional to 751.20, 1,125.72 and 426.66

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Solution

The fourth proportional to 751.20, 1,125.72 and 426.66 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.20 : 1,125.72 = 426.66 : x
  2. Step 2: Convert to fraction form
    751.20/1,125.72 = 426.66/x
  3. Step 3: Cross multiply
    751.20x = 1,125.72 × 426.66
  4. Step 4: Simplify right side
    751.20x = 480,299.70
  5. Step 5: Solve for x
    x = 480,299.70/751.20
  6. Step 6: Final answer
    x = 639.38

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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.