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Finding the Fourth Proportional to 18,979.85, 28,470.47 and 7,132.38

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Solution

The fourth proportional to 18,979.85, 28,470.47 and 7,132.38 is: 10,698.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.85 : 28,470.47 = 7,132.38 : x
  2. Step 2: Convert to fraction form
    18,979.85/28,470.47 = 7,132.38/x
  3. Step 3: Cross multiply
    18,979.85x = 28,470.47 × 7,132.38
  4. Step 4: Simplify right side
    18,979.85x = 203,062,175.16
  5. Step 5: Solve for x
    x = 203,062,175.16/18,979.85
  6. Step 6: Final answer
    x = 10,698.83

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1.5x scale

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.