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Finding the Fourth Proportional to 159.76, 238.40 and 140.80

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Solution

The fourth proportional to 159.76, 238.40 and 140.80 is: 210.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.76 : 238.40 = 140.80 : x
  2. Step 2: Convert to fraction form
    159.76/238.40 = 140.80/x
  3. Step 3: Cross multiply
    159.76x = 238.40 × 140.80
  4. Step 4: Simplify right side
    159.76x = 33,566.72
  5. Step 5: Solve for x
    x = 33,566.72/159.76
  6. Step 6: Final answer
    x = 210.11

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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.