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Finding the Fourth Proportional to 12,491.11, 17,208.42 and 8,707.40

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Solution

The fourth proportional to 12,491.11, 17,208.42 and 8,707.40 is: 11,995.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,491.11 : 17,208.42 = 8,707.40 : x
  2. Step 2: Convert to fraction form
    12,491.11/17,208.42 = 8,707.40/x
  3. Step 3: Cross multiply
    12,491.11x = 17,208.42 × 8,707.40
  4. Step 4: Simplify right side
    12,491.11x = 149,840,542.14
  5. Step 5: Solve for x
    x = 149,840,542.14/12,491.11
  6. Step 6: Final answer
    x = 11,995.77

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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.