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Finding the Fourth Proportional to 15,179.20, 20,947.20 and 8,464.91

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Solution

The fourth proportional to 15,179.20, 20,947.20 and 8,464.91 is: 11,681.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,179.20 : 20,947.20 = 8,464.91 : x
  2. Step 2: Convert to fraction form
    15,179.20/20,947.20 = 8,464.91/x
  3. Step 3: Cross multiply
    15,179.20x = 20,947.20 × 8,464.91
  4. Step 4: Simplify right side
    15,179.20x = 177,316,162.75
  5. Step 5: Solve for x
    x = 177,316,162.75/15,179.20
  6. Step 6: Final answer
    x = 11,681.52

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1.5x scale

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.