Home / 20,812.80-28,720.20-11,381.16

Finding the Fourth Proportional to 20,812.80, 28,720.20 and 11,381.16

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Solution

The fourth proportional to 20,812.80, 28,720.20 and 11,381.16 is: 15,705.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.80 : 28,720.20 = 11,381.16 : x
  2. Step 2: Convert to fraction form
    20,812.80/28,720.20 = 11,381.16/x
  3. Step 3: Cross multiply
    20,812.80x = 28,720.20 × 11,381.16
  4. Step 4: Simplify right side
    20,812.80x = 326,869,191.43
  5. Step 5: Solve for x
    x = 326,869,191.43/20,812.80
  6. Step 6: Final answer
    x = 15,705.20

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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.