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Finding the Fourth Proportional to 99.76, 149.70 and 76.99

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Solution

The fourth proportional to 99.76, 149.70 and 76.99 is: 115.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.76 : 149.70 = 76.99 : x
  2. Step 2: Convert to fraction form
    99.76/149.70 = 76.99/x
  3. Step 3: Cross multiply
    99.76x = 149.70 × 76.99
  4. Step 4: Simplify right side
    99.76x = 11,525.40
  5. Step 5: Solve for x
    x = 11,525.40/99.76
  6. Step 6: Final answer
    x = 115.53

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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.