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Finding the Fourth Proportional to 624.87, 862.65 and 388.89

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Solution

The fourth proportional to 624.87, 862.65 and 388.89 is: 536.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.87 : 862.65 = 388.89 : x
  2. Step 2: Convert to fraction form
    624.87/862.65 = 388.89/x
  3. Step 3: Cross multiply
    624.87x = 862.65 × 388.89
  4. Step 4: Simplify right side
    624.87x = 335,475.96
  5. Step 5: Solve for x
    x = 335,475.96/624.87
  6. Step 6: Final answer
    x = 536.87

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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.