Home / 20,643.57-28,487.97-11,212.20

Finding the Fourth Proportional to 20,643.57, 28,487.97 and 11,212.20

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Solution

The fourth proportional to 20,643.57, 28,487.97 and 11,212.20 is: 15,472.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.57 : 28,487.97 = 11,212.20 : x
  2. Step 2: Convert to fraction form
    20,643.57/28,487.97 = 11,212.20/x
  3. Step 3: Cross multiply
    20,643.57x = 28,487.97 × 11,212.20
  4. Step 4: Simplify right side
    20,643.57x = 319,412,817.23
  5. Step 5: Solve for x
    x = 319,412,817.23/20,643.57
  6. Step 6: Final answer
    x = 15,472.75

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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.