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Finding the Fourth Proportional to 140.16, 193.29 and 87.69

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Solution

The fourth proportional to 140.16, 193.29 and 87.69 is: 120.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.16 : 193.29 = 87.69 : x
  2. Step 2: Convert to fraction form
    140.16/193.29 = 87.69/x
  3. Step 3: Cross multiply
    140.16x = 193.29 × 87.69
  4. Step 4: Simplify right side
    140.16x = 16,949.60
  5. Step 5: Solve for x
    x = 16,949.60/140.16
  6. Step 6: Final answer
    x = 120.93

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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.