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Finding the Fourth Proportional to 158.79, 238.20 and 128.22

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Solution

The fourth proportional to 158.79, 238.20 and 128.22 is: 192.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.79 : 238.20 = 128.22 : x
  2. Step 2: Convert to fraction form
    158.79/238.20 = 128.22/x
  3. Step 3: Cross multiply
    158.79x = 238.20 × 128.22
  4. Step 4: Simplify right side
    158.79x = 30,542.00
  5. Step 5: Solve for x
    x = 30,542.00/158.79
  6. Step 6: Final answer
    x = 192.34

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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.