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Finding the Fourth Proportional to 143.28, 214.96 and 57.76

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Solution

The fourth proportional to 143.28, 214.96 and 57.76 is: 86.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.28 : 214.96 = 57.76 : x
  2. Step 2: Convert to fraction form
    143.28/214.96 = 57.76/x
  3. Step 3: Cross multiply
    143.28x = 214.96 × 57.76
  4. Step 4: Simplify right side
    143.28x = 12,416.09
  5. Step 5: Solve for x
    x = 12,416.09/143.28
  6. Step 6: Final answer
    x = 86.66

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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.