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Finding the Fourth Proportional to 18,979.49, 28,472.95 and 7,291.73

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Solution

The fourth proportional to 18,979.49, 28,472.95 and 7,291.73 is: 10,939.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.49 : 28,472.95 = 7,291.73 : x
  2. Step 2: Convert to fraction form
    18,979.49/28,472.95 = 7,291.73/x
  3. Step 3: Cross multiply
    18,979.49x = 28,472.95 × 7,291.73
  4. Step 4: Simplify right side
    18,979.49x = 207,617,063.70
  5. Step 5: Solve for x
    x = 207,617,063.70/18,979.49
  6. Step 6: Final answer
    x = 10,939.02

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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.