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Finding the Fourth Proportional to 99.79, 149.77 and 74.05

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Solution

The fourth proportional to 99.79, 149.77 and 74.05 is: 111.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.79 : 149.77 = 74.05 : x
  2. Step 2: Convert to fraction form
    99.79/149.77 = 74.05/x
  3. Step 3: Cross multiply
    99.79x = 149.77 × 74.05
  4. Step 4: Simplify right side
    99.79x = 11,089.72
  5. Step 5: Solve for x
    x = 11,089.72/99.79
  6. Step 6: Final answer
    x = 111.14

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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.