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Finding the Fourth Proportional to 142.70, 196.83 and 115.07

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Solution

The fourth proportional to 142.70, 196.83 and 115.07 is: 158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.70 : 196.83 = 115.07 : x
  2. Step 2: Convert to fraction form
    142.70/196.83 = 115.07/x
  3. Step 3: Cross multiply
    142.70x = 196.83 × 115.07
  4. Step 4: Simplify right side
    142.70x = 22,648.24
  5. Step 5: Solve for x
    x = 22,648.24/142.70
  6. Step 6: Final answer
    x = 158.72

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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.