Home / 20,872.50-28,802.46-11,918.78

Finding the Fourth Proportional to 20,872.50, 28,802.46 and 11,918.78

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Solution

The fourth proportional to 20,872.50, 28,802.46 and 11,918.78 is: 16,447.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.50 : 28,802.46 = 11,918.78 : x
  2. Step 2: Convert to fraction form
    20,872.50/28,802.46 = 11,918.78/x
  3. Step 3: Cross multiply
    20,872.50x = 28,802.46 × 11,918.78
  4. Step 4: Simplify right side
    20,872.50x = 343,290,184.20
  5. Step 5: Solve for x
    x = 343,290,184.20/20,872.50
  6. Step 6: Final answer
    x = 16,447.01

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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.