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Finding the Fourth Proportional to 15,179.70, 20,947.89 and 8,465.42

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Solution

The fourth proportional to 15,179.70, 20,947.89 and 8,465.42 is: 11,682.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,179.70 : 20,947.89 = 8,465.42 : x
  2. Step 2: Convert to fraction form
    15,179.70/20,947.89 = 8,465.42/x
  3. Step 3: Cross multiply
    15,179.70x = 20,947.89 × 8,465.42
  4. Step 4: Simplify right side
    15,179.70x = 177,332,582.22
  5. Step 5: Solve for x
    x = 177,332,582.22/15,179.70
  6. Step 6: Final answer
    x = 11,682.22

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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.