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Finding the Fourth Proportional to 142.18, 213.28 and 65.19

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Solution

The fourth proportional to 142.18, 213.28 and 65.19 is: 97.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.18 : 213.28 = 65.19 : x
  2. Step 2: Convert to fraction form
    142.18/213.28 = 65.19/x
  3. Step 3: Cross multiply
    142.18x = 213.28 × 65.19
  4. Step 4: Simplify right side
    142.18x = 13,903.72
  5. Step 5: Solve for x
    x = 13,903.72/142.18
  6. Step 6: Final answer
    x = 97.79

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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.