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Finding the Fourth Proportional to 20,618, 28,452.84 and 11,186.57

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Solution

The fourth proportional to 20,618, 28,452.84 and 11,186.57 is: 15,437.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,618 : 28,452.84 = 11,186.57 : x
  2. Step 2: Convert to fraction form
    20,618/28,452.84 = 11,186.57/x
  3. Step 3: Cross multiply
    20,618x = 28,452.84 × 11,186.57
  4. Step 4: Simplify right side
    20,618x = 318,289,544.09
  5. Step 5: Solve for x
    x = 318,289,544.09/20,618
  6. Step 6: Final answer
    x = 15,437.46

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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.