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Finding the Fourth Proportional to 159.01, 219.61 and 128.03

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Solution

The fourth proportional to 159.01, 219.61 and 128.03 is: 176.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.01 : 219.61 = 128.03 : x
  2. Step 2: Convert to fraction form
    159.01/219.61 = 128.03/x
  3. Step 3: Cross multiply
    159.01x = 219.61 × 128.03
  4. Step 4: Simplify right side
    159.01x = 28,116.97
  5. Step 5: Solve for x
    x = 28,116.97/159.01
  6. Step 6: Final answer
    x = 176.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.