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Finding the Fourth Proportional to 15,754.40, 21,740.08 and 8,680.87

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Solution

The fourth proportional to 15,754.40, 21,740.08 and 8,680.87 is: 11,979.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,754.40 : 21,740.08 = 8,680.87 : x
  2. Step 2: Convert to fraction form
    15,754.40/21,740.08 = 8,680.87/x
  3. Step 3: Cross multiply
    15,754.40x = 21,740.08 × 8,680.87
  4. Step 4: Simplify right side
    15,754.40x = 188,722,656.16
  5. Step 5: Solve for x
    x = 188,722,656.16/15,754.40
  6. Step 6: Final answer
    x = 11,979.05

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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.