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Finding the Fourth Proportional to 239.79, 330.71 and 177.78

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Solution

The fourth proportional to 239.79, 330.71 and 177.78 is: 245.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.79 : 330.71 = 177.78 : x
  2. Step 2: Convert to fraction form
    239.79/330.71 = 177.78/x
  3. Step 3: Cross multiply
    239.79x = 330.71 × 177.78
  4. Step 4: Simplify right side
    239.79x = 58,792.73
  5. Step 5: Solve for x
    x = 58,792.73/239.79
  6. Step 6: Final answer
    x = 245.18

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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.