Home / 15,519.20-21,421.30-8,809.28

Finding the Fourth Proportional to 15,519.20, 21,421.30 and 8,809.28

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Solution

The fourth proportional to 15,519.20, 21,421.30 and 8,809.28 is: 12,159.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,519.20 : 21,421.30 = 8,809.28 : x
  2. Step 2: Convert to fraction form
    15,519.20/21,421.30 = 8,809.28/x
  3. Step 3: Cross multiply
    15,519.20x = 21,421.30 × 8,809.28
  4. Step 4: Simplify right side
    15,519.20x = 188,706,229.66
  5. Step 5: Solve for x
    x = 188,706,229.66/15,519.20
  6. Step 6: Final answer
    x = 12,159.53

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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.