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Finding the Fourth Proportional to 18,911.92, 28,348.16 and 10,579.72

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Solution

The fourth proportional to 18,911.92, 28,348.16 and 10,579.72 is: 15,858.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.92 : 28,348.16 = 10,579.72 : x
  2. Step 2: Convert to fraction form
    18,911.92/28,348.16 = 10,579.72/x
  3. Step 3: Cross multiply
    18,911.92x = 28,348.16 × 10,579.72
  4. Step 4: Simplify right side
    18,911.92x = 299,915,595.32
  5. Step 5: Solve for x
    x = 299,915,595.32/18,911.92
  6. Step 6: Final answer
    x = 15,858.55

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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.