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Finding the Fourth Proportional to 104.10, 156.26 and 78.49

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Solution

The fourth proportional to 104.10, 156.26 and 78.49 is: 117.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.10 : 156.26 = 78.49 : x
  2. Step 2: Convert to fraction form
    104.10/156.26 = 78.49/x
  3. Step 3: Cross multiply
    104.10x = 156.26 × 78.49
  4. Step 4: Simplify right side
    104.10x = 12,264.85
  5. Step 5: Solve for x
    x = 12,264.85/104.10
  6. Step 6: Final answer
    x = 117.82

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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.