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Finding the Fourth Proportional to 438.86, 658.31 and 207.70

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Solution

The fourth proportional to 438.86, 658.31 and 207.70 is: 311.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.86 : 658.31 = 207.70 : x
  2. Step 2: Convert to fraction form
    438.86/658.31 = 207.70/x
  3. Step 3: Cross multiply
    438.86x = 658.31 × 207.70
  4. Step 4: Simplify right side
    438.86x = 136,728.30
  5. Step 5: Solve for x
    x = 136,728.30/438.86
  6. Step 6: Final answer
    x = 311.55

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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.