Home / 15,115.09-20,858.57-8,400.55

Finding the Fourth Proportional to 15,115.09, 20,858.57 and 8,400.55

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Solution

The fourth proportional to 15,115.09, 20,858.57 and 8,400.55 is: 11,592.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.09 : 20,858.57 = 8,400.55 : x
  2. Step 2: Convert to fraction form
    15,115.09/20,858.57 = 8,400.55/x
  3. Step 3: Cross multiply
    15,115.09x = 20,858.57 × 8,400.55
  4. Step 4: Simplify right side
    15,115.09x = 175,223,460.21
  5. Step 5: Solve for x
    x = 175,223,460.21/15,115.09
  6. Step 6: Final answer
    x = 11,592.62

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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.