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Finding the Fourth Proportional to 239.76, 359.64 and 77.47

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Solution

The fourth proportional to 239.76, 359.64 and 77.47 is: 116.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.76 : 359.64 = 77.47 : x
  2. Step 2: Convert to fraction form
    239.76/359.64 = 77.47/x
  3. Step 3: Cross multiply
    239.76x = 359.64 × 77.47
  4. Step 4: Simplify right side
    239.76x = 27,860.41
  5. Step 5: Solve for x
    x = 27,860.41/239.76
  6. Step 6: Final answer
    x = 116.20

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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.