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Finding the Fourth Proportional to 142.24, 212.96 and 130.90

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Solution

The fourth proportional to 142.24, 212.96 and 130.90 is: 195.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.24 : 212.96 = 130.90 : x
  2. Step 2: Convert to fraction form
    142.24/212.96 = 130.90/x
  3. Step 3: Cross multiply
    142.24x = 212.96 × 130.90
  4. Step 4: Simplify right side
    142.24x = 27,875.81
  5. Step 5: Solve for x
    x = 27,875.81/142.24
  6. Step 6: Final answer
    x = 195.98

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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.