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Finding the Fourth Proportional to 624.20, 861.38 and 375.72

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Solution

The fourth proportional to 624.20, 861.38 and 375.72 is: 518.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.20 : 861.38 = 375.72 : x
  2. Step 2: Convert to fraction form
    624.20/861.38 = 375.72/x
  3. Step 3: Cross multiply
    624.20x = 861.38 × 375.72
  4. Step 4: Simplify right side
    624.20x = 323,635.82
  5. Step 5: Solve for x
    x = 323,635.82/624.20
  6. Step 6: Final answer
    x = 518.49

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1.5x scale

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.