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Finding the Fourth Proportional to 747.22, 1,120.47 and 422.86

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Solution

The fourth proportional to 747.22, 1,120.47 and 422.86 is: 634.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.22 : 1,120.47 = 422.86 : x
  2. Step 2: Convert to fraction form
    747.22/1,120.47 = 422.86/x
  3. Step 3: Cross multiply
    747.22x = 1,120.47 × 422.86
  4. Step 4: Simplify right side
    747.22x = 473,801.94
  5. Step 5: Solve for x
    x = 473,801.94/747.22
  6. Step 6: Final answer
    x = 634.09

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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.