Home / 20,812.05-28,720.18-11,380.60

Finding the Fourth Proportional to 20,812.05, 28,720.18 and 11,380.60

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Solution

The fourth proportional to 20,812.05, 28,720.18 and 11,380.60 is: 15,704.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.05 : 28,720.18 = 11,380.60 : x
  2. Step 2: Convert to fraction form
    20,812.05/28,720.18 = 11,380.60/x
  3. Step 3: Cross multiply
    20,812.05x = 28,720.18 × 11,380.60
  4. Step 4: Simplify right side
    20,812.05x = 326,852,880.51
  5. Step 5: Solve for x
    x = 326,852,880.51/20,812.05
  6. Step 6: Final answer
    x = 15,704.98

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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.