Home / 15,754.40-21,741.28-8,680.80

Finding the Fourth Proportional to 15,754.40, 21,741.28 and 8,680.80

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Solution

The fourth proportional to 15,754.40, 21,741.28 and 8,680.80 is: 11,979.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,754.40 : 21,741.28 = 8,680.80 : x
  2. Step 2: Convert to fraction form
    15,754.40/21,741.28 = 8,680.80/x
  3. Step 3: Cross multiply
    15,754.40x = 21,741.28 × 8,680.80
  4. Step 4: Simplify right side
    15,754.40x = 188,731,703.42
  5. Step 5: Solve for x
    x = 188,731,703.42/15,754.40
  6. Step 6: Final answer
    x = 11,979.62

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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.