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Finding the Fourth Proportional to 143.38, 215.12 and 56.73

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Solution

The fourth proportional to 143.38, 215.12 and 56.73 is: 85.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.38 : 215.12 = 56.73 : x
  2. Step 2: Convert to fraction form
    143.38/215.12 = 56.73/x
  3. Step 3: Cross multiply
    143.38x = 215.12 × 56.73
  4. Step 4: Simplify right side
    143.38x = 12,204.71
  5. Step 5: Solve for x
    x = 12,204.71/143.38
  6. Step 6: Final answer
    x = 85.12

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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.