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Finding the Fourth Proportional to 105.04, 156.96 and 80.20

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Solution

The fourth proportional to 105.04, 156.96 and 80.20 is: 119.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.04 : 156.96 = 80.20 : x
  2. Step 2: Convert to fraction form
    105.04/156.96 = 80.20/x
  3. Step 3: Cross multiply
    105.04x = 156.96 × 80.20
  4. Step 4: Simplify right side
    105.04x = 12,587.01
  5. Step 5: Solve for x
    x = 12,587.01/105.04
  6. Step 6: Final answer
    x = 119.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.