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Finding the Fourth Proportional to 10,891.96, 15,031.08 and 6,112.96

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Solution

The fourth proportional to 10,891.96, 15,031.08 and 6,112.96 is: 8,435.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,891.96 : 15,031.08 = 6,112.96 : x
  2. Step 2: Convert to fraction form
    10,891.96/15,031.08 = 6,112.96/x
  3. Step 3: Cross multiply
    10,891.96x = 15,031.08 × 6,112.96
  4. Step 4: Simplify right side
    10,891.96x = 91,884,390.80
  5. Step 5: Solve for x
    x = 91,884,390.80/10,891.96
  6. Step 6: Final answer
    x = 8,435.98

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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.