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Finding the Fourth Proportional to 11,149.12, 15,390 and 9,570.88

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Solution

The fourth proportional to 11,149.12, 15,390 and 9,570.88 is: 13,211.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,149.12 : 15,390 = 9,570.88 : x
  2. Step 2: Convert to fraction form
    11,149.12/15,390 = 9,570.88/x
  3. Step 3: Cross multiply
    11,149.12x = 15,390 × 9,570.88
  4. Step 4: Simplify right side
    11,149.12x = 147,295,843.20
  5. Step 5: Solve for x
    x = 147,295,843.20/11,149.12
  6. Step 6: Final answer
    x = 13,211.43

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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.