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Finding the Fourth Proportional to 750.85, 1,125.39 and 426.44

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Solution

The fourth proportional to 750.85, 1,125.39 and 426.44 is: 639.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.85 : 1,125.39 = 426.44 : x
  2. Step 2: Convert to fraction form
    750.85/1,125.39 = 426.44/x
  3. Step 3: Cross multiply
    750.85x = 1,125.39 × 426.44
  4. Step 4: Simplify right side
    750.85x = 479,911.31
  5. Step 5: Solve for x
    x = 479,911.31/750.85
  6. Step 6: Final answer
    x = 639.16

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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.