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Finding the Fourth Proportional to 76.99, 115.35 and 74.18

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Solution

The fourth proportional to 76.99, 115.35 and 74.18 is: 111.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.99 : 115.35 = 74.18 : x
  2. Step 2: Convert to fraction form
    76.99/115.35 = 74.18/x
  3. Step 3: Cross multiply
    76.99x = 115.35 × 74.18
  4. Step 4: Simplify right side
    76.99x = 8,555.72
  5. Step 5: Solve for x
    x = 8,555.72/76.99
  6. Step 6: Final answer
    x = 111.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.