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Finding the Fourth Proportional to 102,979.40, 154,209.90 and 67,728.20

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Solution

The fourth proportional to 102,979.40, 154,209.90 and 67,728.20 is: 101,421.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,979.40 : 154,209.90 = 67,728.20 : x
  2. Step 2: Convert to fraction form
    102,979.40/154,209.90 = 67,728.20/x
  3. Step 3: Cross multiply
    102,979.40x = 154,209.90 × 67,728.20
  4. Step 4: Simplify right side
    102,979.40x = 10,444,358,949.18
  5. Step 5: Solve for x
    x = 10,444,358,949.18/102,979.40
  6. Step 6: Final answer
    x = 101,421.83

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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.