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Finding the Fourth Proportional to 624.48, 861.12 and 428.28

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Solution

The fourth proportional to 624.48, 861.12 and 428.28 is: 590.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.48 : 861.12 = 428.28 : x
  2. Step 2: Convert to fraction form
    624.48/861.12 = 428.28/x
  3. Step 3: Cross multiply
    624.48x = 861.12 × 428.28
  4. Step 4: Simplify right side
    624.48x = 368,800.47
  5. Step 5: Solve for x
    x = 368,800.47/624.48
  6. Step 6: Final answer
    x = 590.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.