Home / 15,115.59-20,869.70-13,517.28

Finding the Fourth Proportional to 15,115.59, 20,869.70 and 13,517.28

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Solution

The fourth proportional to 15,115.59, 20,869.70 and 13,517.28 is: 18,662.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.59 : 20,869.70 = 13,517.28 : x
  2. Step 2: Convert to fraction form
    15,115.59/20,869.70 = 13,517.28/x
  3. Step 3: Cross multiply
    15,115.59x = 20,869.70 × 13,517.28
  4. Step 4: Simplify right side
    15,115.59x = 282,101,510.83
  5. Step 5: Solve for x
    x = 282,101,510.83/15,115.59
  6. Step 6: Final answer
    x = 18,662.95

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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.