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Finding the Fourth Proportional to 142.12, 213.10 and 90.84

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Solution

The fourth proportional to 142.12, 213.10 and 90.84 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.12 : 213.10 = 90.84 : x
  2. Step 2: Convert to fraction form
    142.12/213.10 = 90.84/x
  3. Step 3: Cross multiply
    142.12x = 213.10 × 90.84
  4. Step 4: Simplify right side
    142.12x = 19,358.00
  5. Step 5: Solve for x
    x = 19,358.00/142.12
  6. Step 6: Final answer
    x = 136.21

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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.