Home / 20,870.69-28,839.74-15,195.59

Finding the Fourth Proportional to 20,870.69, 28,839.74 and 15,195.59

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Solution

The fourth proportional to 20,870.69, 28,839.74 and 15,195.59 is: 20,997.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.69 : 28,839.74 = 15,195.59 : x
  2. Step 2: Convert to fraction form
    20,870.69/28,839.74 = 15,195.59/x
  3. Step 3: Cross multiply
    20,870.69x = 28,839.74 × 15,195.59
  4. Step 4: Simplify right side
    20,870.69x = 438,236,720.55
  5. Step 5: Solve for x
    x = 438,236,720.55/20,870.69
  6. Step 6: Final answer
    x = 20,997.71

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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.