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Finding the Fourth Proportional to 142.55, 196.76 and 113.57

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Solution

The fourth proportional to 142.55, 196.76 and 113.57 is: 156.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.55 : 196.76 = 113.57 : x
  2. Step 2: Convert to fraction form
    142.55/196.76 = 113.57/x
  3. Step 3: Cross multiply
    142.55x = 196.76 × 113.57
  4. Step 4: Simplify right side
    142.55x = 22,346.03
  5. Step 5: Solve for x
    x = 22,346.03/142.55
  6. Step 6: Final answer
    x = 156.76

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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.