Home / 21,112.71-29,139.11-12,158.56

Finding the Fourth Proportional to 21,112.71, 29,139.11 and 12,158.56

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Solution

The fourth proportional to 21,112.71, 29,139.11 and 12,158.56 is: 16,780.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,112.71 : 29,139.11 = 12,158.56 : x
  2. Step 2: Convert to fraction form
    21,112.71/29,139.11 = 12,158.56/x
  3. Step 3: Cross multiply
    21,112.71x = 29,139.11 × 12,158.56
  4. Step 4: Simplify right side
    21,112.71x = 354,289,617.28
  5. Step 5: Solve for x
    x = 354,289,617.28/21,112.71
  6. Step 6: Final answer
    x = 16,780.87

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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.