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Finding the Fourth Proportional to 86.54, 119.42 and 47.72

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Solution

The fourth proportional to 86.54, 119.42 and 47.72 is: 65.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.54 : 119.42 = 47.72 : x
  2. Step 2: Convert to fraction form
    86.54/119.42 = 47.72/x
  3. Step 3: Cross multiply
    86.54x = 119.42 × 47.72
  4. Step 4: Simplify right side
    86.54x = 5,698.78
  5. Step 5: Solve for x
    x = 5,698.78/86.54
  6. Step 6: Final answer
    x = 65.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.