Home / 20,851.56-28,775.16-11,420.28

Finding the Fourth Proportional to 20,851.56, 28,775.16 and 11,420.28

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Solution

The fourth proportional to 20,851.56, 28,775.16 and 11,420.28 is: 15,759.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.56 : 28,775.16 = 11,420.28 : x
  2. Step 2: Convert to fraction form
    20,851.56/28,775.16 = 11,420.28/x
  3. Step 3: Cross multiply
    20,851.56x = 28,775.16 × 11,420.28
  4. Step 4: Simplify right side
    20,851.56x = 328,620,384.24
  5. Step 5: Solve for x
    x = 328,620,384.24/20,851.56
  6. Step 6: Final answer
    x = 15,759.99

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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.