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Finding the Fourth Proportional to 158.64, 237.69 and 128.22

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Solution

The fourth proportional to 158.64, 237.69 and 128.22 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.64 : 237.69 = 128.22 : x
  2. Step 2: Convert to fraction form
    158.64/237.69 = 128.22/x
  3. Step 3: Cross multiply
    158.64x = 237.69 × 128.22
  4. Step 4: Simplify right side
    158.64x = 30,476.61
  5. Step 5: Solve for x
    x = 30,476.61/158.64
  6. Step 6: Final answer
    x = 192.11

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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.