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Finding the Fourth Proportional to 161.28, 240.72 and 140.76

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Solution

The fourth proportional to 161.28, 240.72 and 140.76 is: 210.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.28 : 240.72 = 140.76 : x
  2. Step 2: Convert to fraction form
    161.28/240.72 = 140.76/x
  3. Step 3: Cross multiply
    161.28x = 240.72 × 140.76
  4. Step 4: Simplify right side
    161.28x = 33,883.75
  5. Step 5: Solve for x
    x = 33,883.75/161.28
  6. Step 6: Final answer
    x = 210.09

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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.