Home / 15,753.79-21,740.10-8,680.16

Finding the Fourth Proportional to 15,753.79, 21,740.10 and 8,680.16

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Solution

The fourth proportional to 15,753.79, 21,740.10 and 8,680.16 is: 11,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,753.79 : 21,740.10 = 8,680.16 : x
  2. Step 2: Convert to fraction form
    15,753.79/21,740.10 = 8,680.16/x
  3. Step 3: Cross multiply
    15,753.79x = 21,740.10 × 8,680.16
  4. Step 4: Simplify right side
    15,753.79x = 188,707,568.22
  5. Step 5: Solve for x
    x = 188,707,568.22/15,753.79
  6. Step 6: Final answer
    x = 11,978.55

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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.