Home / 15,400.80-21,252.78-9,115.20

Finding the Fourth Proportional to 15,400.80, 21,252.78 and 9,115.20

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Solution

The fourth proportional to 15,400.80, 21,252.78 and 9,115.20 is: 12,578.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,400.80 : 21,252.78 = 9,115.20 : x
  2. Step 2: Convert to fraction form
    15,400.80/21,252.78 = 9,115.20/x
  3. Step 3: Cross multiply
    15,400.80x = 21,252.78 × 9,115.20
  4. Step 4: Simplify right side
    15,400.80x = 193,723,340.26
  5. Step 5: Solve for x
    x = 193,723,340.26/15,400.80
  6. Step 6: Final answer
    x = 12,578.78

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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.