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Finding the Fourth Proportional to 143.65, 215.31 and 97.99

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Solution

The fourth proportional to 143.65, 215.31 and 97.99 is: 146.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.65 : 215.31 = 97.99 : x
  2. Step 2: Convert to fraction form
    143.65/215.31 = 97.99/x
  3. Step 3: Cross multiply
    143.65x = 215.31 × 97.99
  4. Step 4: Simplify right side
    143.65x = 21,098.23
  5. Step 5: Solve for x
    x = 21,098.23/143.65
  6. Step 6: Final answer
    x = 146.87

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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.