Home / 15,115.88-20,870.07-13,517.55

Finding the Fourth Proportional to 15,115.88, 20,870.07 and 13,517.55

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Solution

The fourth proportional to 15,115.88, 20,870.07 and 13,517.55 is: 18,663.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.88 : 20,870.07 = 13,517.55 : x
  2. Step 2: Convert to fraction form
    15,115.88/20,870.07 = 13,517.55/x
  3. Step 3: Cross multiply
    15,115.88x = 20,870.07 × 13,517.55
  4. Step 4: Simplify right side
    15,115.88x = 282,112,214.73
  5. Step 5: Solve for x
    x = 282,112,214.73/15,115.88
  6. Step 6: Final answer
    x = 18,663.31

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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.