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Finding the Fourth Proportional to 438.70, 658.05 and 265.90

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Solution

The fourth proportional to 438.70, 658.05 and 265.90 is: 398.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.70 : 658.05 = 265.90 : x
  2. Step 2: Convert to fraction form
    438.70/658.05 = 265.90/x
  3. Step 3: Cross multiply
    438.70x = 658.05 × 265.90
  4. Step 4: Simplify right side
    438.70x = 174,975.50
  5. Step 5: Solve for x
    x = 174,975.50/438.70
  6. Step 6: Final answer
    x = 398.85

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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.