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Finding the Fourth Proportional to 158.96, 238.28 and 77.68

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Solution

The fourth proportional to 158.96, 238.28 and 77.68 is: 116.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.96 : 238.28 = 77.68 : x
  2. Step 2: Convert to fraction form
    158.96/238.28 = 77.68/x
  3. Step 3: Cross multiply
    158.96x = 238.28 × 77.68
  4. Step 4: Simplify right side
    158.96x = 18,509.59
  5. Step 5: Solve for x
    x = 18,509.59/158.96
  6. Step 6: Final answer
    x = 116.44

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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.