Home / 20,721.68-28,595.92-11,290.25

Finding the Fourth Proportional to 20,721.68, 28,595.92 and 11,290.25

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Solution

The fourth proportional to 20,721.68, 28,595.92 and 11,290.25 is: 15,580.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.68 : 28,595.92 = 11,290.25 : x
  2. Step 2: Convert to fraction form
    20,721.68/28,595.92 = 11,290.25/x
  3. Step 3: Cross multiply
    20,721.68x = 28,595.92 × 11,290.25
  4. Step 4: Simplify right side
    20,721.68x = 322,854,968.86
  5. Step 5: Solve for x
    x = 322,854,968.86/20,721.68
  6. Step 6: Final answer
    x = 15,580.54

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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.