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Finding the Fourth Proportional to 104.15, 156.47 and 80.26

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Solution

The fourth proportional to 104.15, 156.47 and 80.26 is: 120.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.15 : 156.47 = 80.26 : x
  2. Step 2: Convert to fraction form
    104.15/156.47 = 80.26/x
  3. Step 3: Cross multiply
    104.15x = 156.47 × 80.26
  4. Step 4: Simplify right side
    104.15x = 12,557.49
  5. Step 5: Solve for x
    x = 12,557.49/104.15
  6. Step 6: Final answer
    x = 120.57

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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.