Home / 20,878.20-28,812.16-11,926.90

Finding the Fourth Proportional to 20,878.20, 28,812.16 and 11,926.90

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Solution

The fourth proportional to 20,878.20, 28,812.16 and 11,926.90 is: 16,459.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.20 : 28,812.16 = 11,926.90 : x
  2. Step 2: Convert to fraction form
    20,878.20/28,812.16 = 11,926.90/x
  3. Step 3: Cross multiply
    20,878.20x = 28,812.16 × 11,926.90
  4. Step 4: Simplify right side
    20,878.20x = 343,639,751.10
  5. Step 5: Solve for x
    x = 343,639,751.10/20,878.20
  6. Step 6: Final answer
    x = 16,459.26

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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.