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Finding the Fourth Proportional to 15,125.97, 20,865.16 and 12,559.21

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Solution

The fourth proportional to 15,125.97, 20,865.16 and 12,559.21 is: 17,324.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,125.97 : 20,865.16 = 12,559.21 : x
  2. Step 2: Convert to fraction form
    15,125.97/20,865.16 = 12,559.21/x
  3. Step 3: Cross multiply
    15,125.97x = 20,865.16 × 12,559.21
  4. Step 4: Simplify right side
    15,125.97x = 262,049,926.12
  5. Step 5: Solve for x
    x = 262,049,926.12/15,125.97
  6. Step 6: Final answer
    x = 17,324.50

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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.