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Finding the Fourth Proportional to 159.28, 238.72 and 90.76

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Solution

The fourth proportional to 159.28, 238.72 and 90.76 is: 136.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.28 : 238.72 = 90.76 : x
  2. Step 2: Convert to fraction form
    159.28/238.72 = 90.76/x
  3. Step 3: Cross multiply
    159.28x = 238.72 × 90.76
  4. Step 4: Simplify right side
    159.28x = 21,666.23
  5. Step 5: Solve for x
    x = 21,666.23/159.28
  6. Step 6: Final answer
    x = 136.03

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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.