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Finding the Fourth Proportional to 111,918.57, 154,358.58 and 79,154.88

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Solution

The fourth proportional to 111,918.57, 154,358.58 and 79,154.88 is: 109,170.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,918.57 : 154,358.58 = 79,154.88 : x
  2. Step 2: Convert to fraction form
    111,918.57/154,358.58 = 79,154.88/x
  3. Step 3: Cross multiply
    111,918.57x = 154,358.58 × 79,154.88
  4. Step 4: Simplify right side
    111,918.57x = 12,218,234,876.87
  5. Step 5: Solve for x
    x = 12,218,234,876.87/111,918.57
  6. Step 6: Final answer
    x = 109,170.76

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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.