Home / 20,965.23-28,920.87-15,921.09

Finding the Fourth Proportional to 20,965.23, 28,920.87 and 15,921.09

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Solution

The fourth proportional to 20,965.23, 28,920.87 and 15,921.09 is: 21,962.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.23 : 28,920.87 = 15,921.09 : x
  2. Step 2: Convert to fraction form
    20,965.23/28,920.87 = 15,921.09/x
  3. Step 3: Cross multiply
    20,965.23x = 28,920.87 × 15,921.09
  4. Step 4: Simplify right side
    20,965.23x = 460,451,774.15
  5. Step 5: Solve for x
    x = 460,451,774.15/20,965.23
  6. Step 6: Final answer
    x = 21,962.64

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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.