Home / 10,921.79-16,382.69-8,720.21

Finding the Fourth Proportional to 10,921.79, 16,382.69 and 8,720.21

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Solution

The fourth proportional to 10,921.79, 16,382.69 and 8,720.21 is: 13,080.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921.79 : 16,382.69 = 8,720.21 : x
  2. Step 2: Convert to fraction form
    10,921.79/16,382.69 = 8,720.21/x
  3. Step 3: Cross multiply
    10,921.79x = 16,382.69 × 8,720.21
  4. Step 4: Simplify right side
    10,921.79x = 142,860,497.16
  5. Step 5: Solve for x
    x = 142,860,497.16/10,921.79
  6. Step 6: Final answer
    x = 13,080.32

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.