Home / 20,721.66-28,595.86-11,290.29

Finding the Fourth Proportional to 20,721.66, 28,595.86 and 11,290.29

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Solution

The fourth proportional to 20,721.66, 28,595.86 and 11,290.29 is: 15,580.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.66 : 28,595.86 = 11,290.29 : x
  2. Step 2: Convert to fraction form
    20,721.66/28,595.86 = 11,290.29/x
  3. Step 3: Cross multiply
    20,721.66x = 28,595.86 × 11,290.29
  4. Step 4: Simplify right side
    20,721.66x = 322,855,552.20
  5. Step 5: Solve for x
    x = 322,855,552.20/20,721.66
  6. Step 6: Final answer
    x = 15,580.58

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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.