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Finding the Fourth Proportional to 624.12, 861 and 387.84

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Solution

The fourth proportional to 624.12, 861 and 387.84 is: 535.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.12 : 861 = 387.84 : x
  2. Step 2: Convert to fraction form
    624.12/861 = 387.84/x
  3. Step 3: Cross multiply
    624.12x = 861 × 387.84
  4. Step 4: Simplify right side
    624.12x = 333,930.24
  5. Step 5: Solve for x
    x = 333,930.24/624.12
  6. Step 6: Final answer
    x = 535.04

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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.