Home / 20,851.59-28,775.20-11,420.22

Finding the Fourth Proportional to 20,851.59, 28,775.20 and 11,420.22

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Solution

The fourth proportional to 20,851.59, 28,775.20 and 11,420.22 is: 15,759.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.59 : 28,775.20 = 11,420.22 : x
  2. Step 2: Convert to fraction form
    20,851.59/28,775.20 = 11,420.22/x
  3. Step 3: Cross multiply
    20,851.59x = 28,775.20 × 11,420.22
  4. Step 4: Simplify right side
    20,851.59x = 328,619,215.31
  5. Step 5: Solve for x
    x = 328,619,215.31/20,851.59
  6. Step 6: Final answer
    x = 15,759.91

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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.