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Finding the Fourth Proportional to 624.21, 861.48 and 388.14

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Solution

The fourth proportional to 624.21, 861.48 and 388.14 is: 535.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.21 : 861.48 = 388.14 : x
  2. Step 2: Convert to fraction form
    624.21/861.48 = 388.14/x
  3. Step 3: Cross multiply
    624.21x = 861.48 × 388.14
  4. Step 4: Simplify right side
    624.21x = 334,374.85
  5. Step 5: Solve for x
    x = 334,374.85/624.21
  6. Step 6: Final answer
    x = 535.68

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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.