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Finding the Fourth Proportional to 438.88, 658.29 and 207.70

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Solution

The fourth proportional to 438.88, 658.29 and 207.70 is: 311.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.88 : 658.29 = 207.70 : x
  2. Step 2: Convert to fraction form
    438.88/658.29 = 207.70/x
  3. Step 3: Cross multiply
    438.88x = 658.29 × 207.70
  4. Step 4: Simplify right side
    438.88x = 136,726.83
  5. Step 5: Solve for x
    x = 136,726.83/438.88
  6. Step 6: Final answer
    x = 311.54

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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.