Home / 20,720.25-28,593.95-11,288.81

Finding the Fourth Proportional to 20,720.25, 28,593.95 and 11,288.81

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Solution

The fourth proportional to 20,720.25, 28,593.95 and 11,288.81 is: 15,578.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.25 : 28,593.95 = 11,288.81 : x
  2. Step 2: Convert to fraction form
    20,720.25/28,593.95 = 11,288.81/x
  3. Step 3: Cross multiply
    20,720.25x = 28,593.95 × 11,288.81
  4. Step 4: Simplify right side
    20,720.25x = 322,791,768.41
  5. Step 5: Solve for x
    x = 322,791,768.41/20,720.25
  6. Step 6: Final answer
    x = 15,578.57

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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.