Home / 20,721.72-28,595.82-11,290.08

Finding the Fourth Proportional to 20,721.72, 28,595.82 and 11,290.08

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Solution

The fourth proportional to 20,721.72, 28,595.82 and 11,290.08 is: 15,580.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.72 : 28,595.82 = 11,290.08 : x
  2. Step 2: Convert to fraction form
    20,721.72/28,595.82 = 11,290.08/x
  3. Step 3: Cross multiply
    20,721.72x = 28,595.82 × 11,290.08
  4. Step 4: Simplify right side
    20,721.72x = 322,849,095.47
  5. Step 5: Solve for x
    x = 322,849,095.47/20,721.72
  6. Step 6: Final answer
    x = 15,580.23

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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.