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Finding the Fourth Proportional to 143.28, 215.16 and 97.68

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Solution

The fourth proportional to 143.28, 215.16 and 97.68 is: 146.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.28 : 215.16 = 97.68 : x
  2. Step 2: Convert to fraction form
    143.28/215.16 = 97.68/x
  3. Step 3: Cross multiply
    143.28x = 215.16 × 97.68
  4. Step 4: Simplify right side
    143.28x = 21,016.83
  5. Step 5: Solve for x
    x = 21,016.83/143.28
  6. Step 6: Final answer
    x = 146.68

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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.