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Finding the Fourth Proportional to 158.77, 238.21 and 81.72

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Solution

The fourth proportional to 158.77, 238.21 and 81.72 is: 122.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.77 : 238.21 = 81.72 : x
  2. Step 2: Convert to fraction form
    158.77/238.21 = 81.72/x
  3. Step 3: Cross multiply
    158.77x = 238.21 × 81.72
  4. Step 4: Simplify right side
    158.77x = 19,466.52
  5. Step 5: Solve for x
    x = 19,466.52/158.77
  6. Step 6: Final answer
    x = 122.61

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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.