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Finding the Fourth Proportional to 331.92, 497.88 and 139.76

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Solution

The fourth proportional to 331.92, 497.88 and 139.76 is: 209.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.92 : 497.88 = 139.76 : x
  2. Step 2: Convert to fraction form
    331.92/497.88 = 139.76/x
  3. Step 3: Cross multiply
    331.92x = 497.88 × 139.76
  4. Step 4: Simplify right side
    331.92x = 69,583.71
  5. Step 5: Solve for x
    x = 69,583.71/331.92
  6. Step 6: Final answer
    x = 209.64

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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.