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Finding the Fourth Proportional to 142.26, 196.38 and 86.99

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Solution

The fourth proportional to 142.26, 196.38 and 86.99 is: 120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.26 : 196.38 = 86.99 : x
  2. Step 2: Convert to fraction form
    142.26/196.38 = 86.99/x
  3. Step 3: Cross multiply
    142.26x = 196.38 × 86.99
  4. Step 4: Simplify right side
    142.26x = 17,082.11
  5. Step 5: Solve for x
    x = 17,082.11/142.26
  6. Step 6: Final answer
    x = 120.08

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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.