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Finding the Fourth Proportional to 438.78, 658.02 and 316.68

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Solution

The fourth proportional to 438.78, 658.02 and 316.68 is: 474.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.78 : 658.02 = 316.68 : x
  2. Step 2: Convert to fraction form
    438.78/658.02 = 316.68/x
  3. Step 3: Cross multiply
    438.78x = 658.02 × 316.68
  4. Step 4: Simplify right side
    438.78x = 208,381.77
  5. Step 5: Solve for x
    x = 208,381.77/438.78
  6. Step 6: Final answer
    x = 474.91

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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.