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Finding the Fourth Proportional to 143.48, 215.08 and 71.24

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Solution

The fourth proportional to 143.48, 215.08 and 71.24 is: 106.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.48 : 215.08 = 71.24 : x
  2. Step 2: Convert to fraction form
    143.48/215.08 = 71.24/x
  3. Step 3: Cross multiply
    143.48x = 215.08 × 71.24
  4. Step 4: Simplify right side
    143.48x = 15,322.30
  5. Step 5: Solve for x
    x = 15,322.30/143.48
  6. Step 6: Final answer
    x = 106.79

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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.