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Finding the Fourth Proportional to 624.61, 861.54 and 388.31

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Solution

The fourth proportional to 624.61, 861.54 and 388.31 is: 535.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.61 : 861.54 = 388.31 : x
  2. Step 2: Convert to fraction form
    624.61/861.54 = 388.31/x
  3. Step 3: Cross multiply
    624.61x = 861.54 × 388.31
  4. Step 4: Simplify right side
    624.61x = 334,544.60
  5. Step 5: Solve for x
    x = 334,544.60/624.61
  6. Step 6: Final answer
    x = 535.61

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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.