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Finding the Fourth Proportional to 77.96, 107.60 and 48.88

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Solution

The fourth proportional to 77.96, 107.60 and 48.88 is: 67.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.96 : 107.60 = 48.88 : x
  2. Step 2: Convert to fraction form
    77.96/107.60 = 48.88/x
  3. Step 3: Cross multiply
    77.96x = 107.60 × 48.88
  4. Step 4: Simplify right side
    77.96x = 5,259.49
  5. Step 5: Solve for x
    x = 5,259.49/77.96
  6. Step 6: Final answer
    x = 67.46

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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.