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Finding the Fourth Proportional to 239.77, 359.71 and 77.45

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Solution

The fourth proportional to 239.77, 359.71 and 77.45 is: 116.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.77 : 359.71 = 77.45 : x
  2. Step 2: Convert to fraction form
    239.77/359.71 = 77.45/x
  3. Step 3: Cross multiply
    239.77x = 359.71 × 77.45
  4. Step 4: Simplify right side
    239.77x = 27,859.54
  5. Step 5: Solve for x
    x = 27,859.54/239.77
  6. Step 6: Final answer
    x = 116.19

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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.