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Finding the Fourth Proportional to 425.18, 586.78 and 238.70

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Solution

The fourth proportional to 425.18, 586.78 and 238.70 is: 329.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.18 : 586.78 = 238.70 : x
  2. Step 2: Convert to fraction form
    425.18/586.78 = 238.70/x
  3. Step 3: Cross multiply
    425.18x = 586.78 × 238.70
  4. Step 4: Simplify right side
    425.18x = 140,060.86
  5. Step 5: Solve for x
    x = 140,060.86/425.18
  6. Step 6: Final answer
    x = 329.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.