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Finding the Fourth Proportional to 624.11, 861.48 and 388.10

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Solution

The fourth proportional to 624.11, 861.48 and 388.10 is: 535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.11 : 861.48 = 388.10 : x
  2. Step 2: Convert to fraction form
    624.11/861.48 = 388.10/x
  3. Step 3: Cross multiply
    624.11x = 861.48 × 388.10
  4. Step 4: Simplify right side
    624.11x = 334,336.08
  5. Step 5: Solve for x
    x = 334,336.08/624.11
  6. Step 6: Final answer
    x = 535.70

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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.