Home / 20,405.16-28,169.08-15,857.11

Finding the Fourth Proportional to 20,405.16, 28,169.08 and 15,857.11

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Solution

The fourth proportional to 20,405.16, 28,169.08 and 15,857.11 is: 21,890.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.16 : 28,169.08 = 15,857.11 : x
  2. Step 2: Convert to fraction form
    20,405.16/28,169.08 = 15,857.11/x
  3. Step 3: Cross multiply
    20,405.16x = 28,169.08 × 15,857.11
  4. Step 4: Simplify right side
    20,405.16x = 446,680,059.31
  5. Step 5: Solve for x
    x = 446,680,059.31/20,405.16
  6. Step 6: Final answer
    x = 21,890.55

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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.