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Finding the Fourth Proportional to 142.61, 213.80 and 69.42

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Solution

The fourth proportional to 142.61, 213.80 and 69.42 is: 104.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.61 : 213.80 = 69.42 : x
  2. Step 2: Convert to fraction form
    142.61/213.80 = 69.42/x
  3. Step 3: Cross multiply
    142.61x = 213.80 × 69.42
  4. Step 4: Simplify right side
    142.61x = 14,841.65
  5. Step 5: Solve for x
    x = 14,841.65/142.61
  6. Step 6: Final answer
    x = 104.08

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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.