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Finding the Fourth Proportional to 111.67, 154.15 and 79.00

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Solution

The fourth proportional to 111.67, 154.15 and 79.00 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.67 : 154.15 = 79.00 : x
  2. Step 2: Convert to fraction form
    111.67/154.15 = 79.00/x
  3. Step 3: Cross multiply
    111.67x = 154.15 × 79.00
  4. Step 4: Simplify right side
    111.67x = 12,177.27
  5. Step 5: Solve for x
    x = 12,177.27/111.67
  6. Step 6: Final answer
    x = 109.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.