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Finding the Fourth Proportional to 142.13, 213.23 and 77.11

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Solution

The fourth proportional to 142.13, 213.23 and 77.11 is: 115.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.13 : 213.23 = 77.11 : x
  2. Step 2: Convert to fraction form
    142.13/213.23 = 77.11/x
  3. Step 3: Cross multiply
    142.13x = 213.23 × 77.11
  4. Step 4: Simplify right side
    142.13x = 16,442.51
  5. Step 5: Solve for x
    x = 16,442.51/142.13
  6. Step 6: Final answer
    x = 115.69

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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.