Home / 20,881.20-28,816.40-11,929.04

Finding the Fourth Proportional to 20,881.20, 28,816.40 and 11,929.04

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Solution

The fourth proportional to 20,881.20, 28,816.40 and 11,929.04 is: 16,462.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.20 : 28,816.40 = 11,929.04 : x
  2. Step 2: Convert to fraction form
    20,881.20/28,816.40 = 11,929.04/x
  3. Step 3: Cross multiply
    20,881.20x = 28,816.40 × 11,929.04
  4. Step 4: Simplify right side
    20,881.20x = 343,751,988.26
  5. Step 5: Solve for x
    x = 343,751,988.26/20,881.20
  6. Step 6: Final answer
    x = 16,462.27

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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.