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Finding the Fourth Proportional to 78.96, 108.95 and 47.86

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Solution

The fourth proportional to 78.96, 108.95 and 47.86 is: 66.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.96 : 108.95 = 47.86 : x
  2. Step 2: Convert to fraction form
    78.96/108.95 = 47.86/x
  3. Step 3: Cross multiply
    78.96x = 108.95 × 47.86
  4. Step 4: Simplify right side
    78.96x = 5,214.72
  5. Step 5: Solve for x
    x = 5,214.72/78.96
  6. Step 6: Final answer
    x = 66.04

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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.