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Finding the Fourth Proportional to 158.64, 236.97 and 128.28

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Solution

The fourth proportional to 158.64, 236.97 and 128.28 is: 191.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.64 : 236.97 = 128.28 : x
  2. Step 2: Convert to fraction form
    158.64/236.97 = 128.28/x
  3. Step 3: Cross multiply
    158.64x = 236.97 × 128.28
  4. Step 4: Simplify right side
    158.64x = 30,398.51
  5. Step 5: Solve for x
    x = 30,398.51/158.64
  6. Step 6: Final answer
    x = 191.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.