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Finding the Fourth Proportional to 75.80, 113.68 and 20.94

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Solution

The fourth proportional to 75.80, 113.68 and 20.94 is: 31.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.80 : 113.68 = 20.94 : x
  2. Step 2: Convert to fraction form
    75.80/113.68 = 20.94/x
  3. Step 3: Cross multiply
    75.80x = 113.68 × 20.94
  4. Step 4: Simplify right side
    75.80x = 2,380.35
  5. Step 5: Solve for x
    x = 2,380.35/75.80
  6. Step 6: Final answer
    x = 31.40

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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.