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Finding the Fourth Proportional to 438.92, 657.78 and 425.78

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Solution

The fourth proportional to 438.92, 657.78 and 425.78 is: 638.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.92 : 657.78 = 425.78 : x
  2. Step 2: Convert to fraction form
    438.92/657.78 = 425.78/x
  3. Step 3: Cross multiply
    438.92x = 657.78 × 425.78
  4. Step 4: Simplify right side
    438.92x = 280,069.57
  5. Step 5: Solve for x
    x = 280,069.57/438.92
  6. Step 6: Final answer
    x = 638.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.