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Finding the Fourth Proportional to 624.90, 862.11 and 388.68

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Solution

The fourth proportional to 624.90, 862.11 and 388.68 is: 536.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.90 : 862.11 = 388.68 : x
  2. Step 2: Convert to fraction form
    624.90/862.11 = 388.68/x
  3. Step 3: Cross multiply
    624.90x = 862.11 × 388.68
  4. Step 4: Simplify right side
    624.90x = 335,084.91
  5. Step 5: Solve for x
    x = 335,084.91/624.90
  6. Step 6: Final answer
    x = 536.22

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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.