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Finding the Fourth Proportional to 158.66, 238.12 and 77.58

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Solution

The fourth proportional to 158.66, 238.12 and 77.58 is: 116.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.66 : 238.12 = 77.58 : x
  2. Step 2: Convert to fraction form
    158.66/238.12 = 77.58/x
  3. Step 3: Cross multiply
    158.66x = 238.12 × 77.58
  4. Step 4: Simplify right side
    158.66x = 18,473.35
  5. Step 5: Solve for x
    x = 18,473.35/158.66
  6. Step 6: Final answer
    x = 116.43

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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.