Home / 20,405.61-28,157.49-11,451.06

Finding the Fourth Proportional to 20,405.61, 28,157.49 and 11,451.06

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Solution

The fourth proportional to 20,405.61, 28,157.49 and 11,451.06 is: 15,801.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.61 : 28,157.49 = 11,451.06 : x
  2. Step 2: Convert to fraction form
    20,405.61/28,157.49 = 11,451.06/x
  3. Step 3: Cross multiply
    20,405.61x = 28,157.49 × 11,451.06
  4. Step 4: Simplify right side
    20,405.61x = 322,433,107.44
  5. Step 5: Solve for x
    x = 322,433,107.44/20,405.61
  6. Step 6: Final answer
    x = 15,801.20

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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.