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Finding the Fourth Proportional to 79.78, 110.10 and 48.75

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Solution

The fourth proportional to 79.78, 110.10 and 48.75 is: 67.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.78 : 110.10 = 48.75 : x
  2. Step 2: Convert to fraction form
    79.78/110.10 = 48.75/x
  3. Step 3: Cross multiply
    79.78x = 110.10 × 48.75
  4. Step 4: Simplify right side
    79.78x = 5,367.50
  5. Step 5: Solve for x
    x = 5,367.50/79.78
  6. Step 6: Final answer
    x = 67.28

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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.