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Finding the Fourth Proportional to 142.11, 213.57 and 101.79

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Solution

The fourth proportional to 142.11, 213.57 and 101.79 is: 152.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.11 : 213.57 = 101.79 : x
  2. Step 2: Convert to fraction form
    142.11/213.57 = 101.79/x
  3. Step 3: Cross multiply
    142.11x = 213.57 × 101.79
  4. Step 4: Simplify right side
    142.11x = 21,739.29
  5. Step 5: Solve for x
    x = 21,739.29/142.11
  6. Step 6: Final answer
    x = 152.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.