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Finding the Fourth Proportional to 438.70, 657.26 and 232.78

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Solution

The fourth proportional to 438.70, 657.26 and 232.78 is: 348.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.70 : 657.26 = 232.78 : x
  2. Step 2: Convert to fraction form
    438.70/657.26 = 232.78/x
  3. Step 3: Cross multiply
    438.70x = 657.26 × 232.78
  4. Step 4: Simplify right side
    438.70x = 152,996.98
  5. Step 5: Solve for x
    x = 152,996.98/438.70
  6. Step 6: Final answer
    x = 348.75

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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.