Home / 20,638.56-28,480.76-11,207.12

Finding the Fourth Proportional to 20,638.56, 28,480.76 and 11,207.12

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Solution

The fourth proportional to 20,638.56, 28,480.76 and 11,207.12 is: 15,465.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.56 : 28,480.76 = 11,207.12 : x
  2. Step 2: Convert to fraction form
    20,638.56/28,480.76 = 11,207.12/x
  3. Step 3: Cross multiply
    20,638.56x = 28,480.76 × 11,207.12
  4. Step 4: Simplify right side
    20,638.56x = 319,187,295.01
  5. Step 5: Solve for x
    x = 319,187,295.01/20,638.56
  6. Step 6: Final answer
    x = 15,465.58

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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.