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Finding the Fourth Proportional to 11,959.79, 16,505.78 and 9,121.95

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Solution

The fourth proportional to 11,959.79, 16,505.78 and 9,121.95 is: 12,589.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,959.79 : 16,505.78 = 9,121.95 : x
  2. Step 2: Convert to fraction form
    11,959.79/16,505.78 = 9,121.95/x
  3. Step 3: Cross multiply
    11,959.79x = 16,505.78 × 9,121.95
  4. Step 4: Simplify right side
    11,959.79x = 150,564,854.26
  5. Step 5: Solve for x
    x = 150,564,854.26/11,959.79
  6. Step 6: Final answer
    x = 12,589.26

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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.