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Finding the Fourth Proportional to 80.74, 120.87 and 70.18

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Solution

The fourth proportional to 80.74, 120.87 and 70.18 is: 105.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.74 : 120.87 = 70.18 : x
  2. Step 2: Convert to fraction form
    80.74/120.87 = 70.18/x
  3. Step 3: Cross multiply
    80.74x = 120.87 × 70.18
  4. Step 4: Simplify right side
    80.74x = 8,482.66
  5. Step 5: Solve for x
    x = 8,482.66/80.74
  6. Step 6: Final answer
    x = 105.06

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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.