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Finding the Fourth Proportional to 104.46, 156.48 and 78.71

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Solution

The fourth proportional to 104.46, 156.48 and 78.71 is: 117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.46 : 156.48 = 78.71 : x
  2. Step 2: Convert to fraction form
    104.46/156.48 = 78.71/x
  3. Step 3: Cross multiply
    104.46x = 156.48 × 78.71
  4. Step 4: Simplify right side
    104.46x = 12,316.07
  5. Step 5: Solve for x
    x = 12,316.07/104.46
  6. Step 6: Final answer
    x = 117.90

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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.