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Finding the Fourth Proportional to 438.95, 658.21 and 207.79

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Solution

The fourth proportional to 438.95, 658.21 and 207.79 is: 311.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.95 : 658.21 = 207.79 : x
  2. Step 2: Convert to fraction form
    438.95/658.21 = 207.79/x
  3. Step 3: Cross multiply
    438.95x = 658.21 × 207.79
  4. Step 4: Simplify right side
    438.95x = 136,769.46
  5. Step 5: Solve for x
    x = 136,769.46/438.95
  6. Step 6: Final answer
    x = 311.58

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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.