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Finding the Fourth Proportional to 142.57, 196.68 and 101.11

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Solution

The fourth proportional to 142.57, 196.68 and 101.11 is: 139.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.57 : 196.68 = 101.11 : x
  2. Step 2: Convert to fraction form
    142.57/196.68 = 101.11/x
  3. Step 3: Cross multiply
    142.57x = 196.68 × 101.11
  4. Step 4: Simplify right side
    142.57x = 19,886.31
  5. Step 5: Solve for x
    x = 19,886.31/142.57
  6. Step 6: Final answer
    x = 139.48

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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.