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Finding the Fourth Proportional to 57.44, 86.32 and 47.28

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Solution

The fourth proportional to 57.44, 86.32 and 47.28 is: 71.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.44 : 86.32 = 47.28 : x
  2. Step 2: Convert to fraction form
    57.44/86.32 = 47.28/x
  3. Step 3: Cross multiply
    57.44x = 86.32 × 47.28
  4. Step 4: Simplify right side
    57.44x = 4,081.21
  5. Step 5: Solve for x
    x = 4,081.21/57.44
  6. Step 6: Final answer
    x = 71.05

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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.