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Finding the Fourth Proportional to 142.18, 213.38 and 69.07

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Solution

The fourth proportional to 142.18, 213.38 and 69.07 is: 103.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.18 : 213.38 = 69.07 : x
  2. Step 2: Convert to fraction form
    142.18/213.38 = 69.07/x
  3. Step 3: Cross multiply
    142.18x = 213.38 × 69.07
  4. Step 4: Simplify right side
    142.18x = 14,738.16
  5. Step 5: Solve for x
    x = 14,738.16/142.18
  6. Step 6: Final answer
    x = 103.66

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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.