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Finding the Fourth Proportional to 76.99, 114.65 and 76.18

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Solution

The fourth proportional to 76.99, 114.65 and 76.18 is: 113.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.99 : 114.65 = 76.18 : x
  2. Step 2: Convert to fraction form
    76.99/114.65 = 76.18/x
  3. Step 3: Cross multiply
    76.99x = 114.65 × 76.18
  4. Step 4: Simplify right side
    76.99x = 8,734.04
  5. Step 5: Solve for x
    x = 8,734.04/76.99
  6. Step 6: Final answer
    x = 113.44

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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.