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Finding the Fourth Proportional to 143.85, 215.60 and 57.14

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Solution

The fourth proportional to 143.85, 215.60 and 57.14 is: 85.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.85 : 215.60 = 57.14 : x
  2. Step 2: Convert to fraction form
    143.85/215.60 = 57.14/x
  3. Step 3: Cross multiply
    143.85x = 215.60 × 57.14
  4. Step 4: Simplify right side
    143.85x = 12,318.45
  5. Step 5: Solve for x
    x = 12,318.45/143.85
  6. Step 6: Final answer
    x = 85.63

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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.