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Finding the Fourth Proportional to 77.65, 107.16 and 48.13

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Solution

The fourth proportional to 77.65, 107.16 and 48.13 is: 66.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.65 : 107.16 = 48.13 : x
  2. Step 2: Convert to fraction form
    77.65/107.16 = 48.13/x
  3. Step 3: Cross multiply
    77.65x = 107.16 × 48.13
  4. Step 4: Simplify right side
    77.65x = 5,157.70
  5. Step 5: Solve for x
    x = 5,157.70/77.65
  6. Step 6: Final answer
    x = 66.43

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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.