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Finding the Fourth Proportional to 15,107.80, 20,849.76 and 9,139.72

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Solution

The fourth proportional to 15,107.80, 20,849.76 and 9,139.72 is: 12,613.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,107.80 : 20,849.76 = 9,139.72 : x
  2. Step 2: Convert to fraction form
    15,107.80/20,849.76 = 9,139.72/x
  3. Step 3: Cross multiply
    15,107.80x = 20,849.76 × 9,139.72
  4. Step 4: Simplify right side
    15,107.80x = 190,560,968.47
  5. Step 5: Solve for x
    x = 190,560,968.47/15,107.80
  6. Step 6: Final answer
    x = 12,613.42

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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.