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Finding the Fourth Proportional to 77.12, 114.90 and 73.04

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Solution

The fourth proportional to 77.12, 114.90 and 73.04 is: 108.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.12 : 114.90 = 73.04 : x
  2. Step 2: Convert to fraction form
    77.12/114.90 = 73.04/x
  3. Step 3: Cross multiply
    77.12x = 114.90 × 73.04
  4. Step 4: Simplify right side
    77.12x = 8,392.30
  5. Step 5: Solve for x
    x = 8,392.30/77.12
  6. Step 6: Final answer
    x = 108.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.