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Finding the Fourth Proportional to 142.68, 196.98 and 103.95

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Solution

The fourth proportional to 142.68, 196.98 and 103.95 is: 143.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.68 : 196.98 = 103.95 : x
  2. Step 2: Convert to fraction form
    142.68/196.98 = 103.95/x
  3. Step 3: Cross multiply
    142.68x = 196.98 × 103.95
  4. Step 4: Simplify right side
    142.68x = 20,476.07
  5. Step 5: Solve for x
    x = 20,476.07/142.68
  6. Step 6: Final answer
    x = 143.51

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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.