Home / 20,618.19-28,453.20-11,186.75

Finding the Fourth Proportional to 20,618.19, 28,453.20 and 11,186.75

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Solution

The fourth proportional to 20,618.19, 28,453.20 and 11,186.75 is: 15,437.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618.19 : 28,453.20 = 11,186.75 : x
  2. Step 2: Convert to fraction form
    20,618.19/28,453.20 = 11,186.75/x
  3. Step 3: Cross multiply
    20,618.19x = 28,453.20 × 11,186.75
  4. Step 4: Simplify right side
    20,618.19x = 318,298,835.10
  5. Step 5: Solve for x
    x = 318,298,835.10/20,618.19
  6. Step 6: Final answer
    x = 15,437.77

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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.