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Finding the Fourth Proportional to 142.10, 213.02 and 55.38

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Solution

The fourth proportional to 142.10, 213.02 and 55.38 is: 83.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.10 : 213.02 = 55.38 : x
  2. Step 2: Convert to fraction form
    142.10/213.02 = 55.38/x
  3. Step 3: Cross multiply
    142.10x = 213.02 × 55.38
  4. Step 4: Simplify right side
    142.10x = 11,797.05
  5. Step 5: Solve for x
    x = 11,797.05/142.10
  6. Step 6: Final answer
    x = 83.02

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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.