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Finding the Fourth Proportional to 75.80, 104.56 and 49.88

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Solution

The fourth proportional to 75.80, 104.56 and 49.88 is: 68.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.80 : 104.56 = 49.88 : x
  2. Step 2: Convert to fraction form
    75.80/104.56 = 49.88/x
  3. Step 3: Cross multiply
    75.80x = 104.56 × 49.88
  4. Step 4: Simplify right side
    75.80x = 5,214.81
  5. Step 5: Solve for x
    x = 5,214.81/75.80
  6. Step 6: Final answer
    x = 68.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.