Home / 20,721.45-28,595.59-11,290.01

Finding the Fourth Proportional to 20,721.45, 28,595.59 and 11,290.01

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Solution

The fourth proportional to 20,721.45, 28,595.59 and 11,290.01 is: 15,580.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.45 : 28,595.59 = 11,290.01 : x
  2. Step 2: Convert to fraction form
    20,721.45/28,595.59 = 11,290.01/x
  3. Step 3: Cross multiply
    20,721.45x = 28,595.59 × 11,290.01
  4. Step 4: Simplify right side
    20,721.45x = 322,844,485.66
  5. Step 5: Solve for x
    x = 322,844,485.66/20,721.45
  6. Step 6: Final answer
    x = 15,580.21

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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.