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Finding the Fourth Proportional to 425.92, 587.80 and 239.40

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Solution

The fourth proportional to 425.92, 587.80 and 239.40 is: 330.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.92 : 587.80 = 239.40 : x
  2. Step 2: Convert to fraction form
    425.92/587.80 = 239.40/x
  3. Step 3: Cross multiply
    425.92x = 587.80 × 239.40
  4. Step 4: Simplify right side
    425.92x = 140,719.32
  5. Step 5: Solve for x
    x = 140,719.32/425.92
  6. Step 6: Final answer
    x = 330.39

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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.