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Finding the Fourth Proportional to 273.20, 409.70 and 78.15

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Solution

The fourth proportional to 273.20, 409.70 and 78.15 is: 117.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.20 : 409.70 = 78.15 : x
  2. Step 2: Convert to fraction form
    273.20/409.70 = 78.15/x
  3. Step 3: Cross multiply
    273.20x = 409.70 × 78.15
  4. Step 4: Simplify right side
    273.20x = 32,016.15
  5. Step 5: Solve for x
    x = 32,016.15/273.20
  6. Step 6: Final answer
    x = 117.19

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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.