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Finding the Fourth Proportional to 13,119.47, 18,105.09 and 7,151.47

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Solution

The fourth proportional to 13,119.47, 18,105.09 and 7,151.47 is: 9,869.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,119.47 : 18,105.09 = 7,151.47 : x
  2. Step 2: Convert to fraction form
    13,119.47/18,105.09 = 7,151.47/x
  3. Step 3: Cross multiply
    13,119.47x = 18,105.09 × 7,151.47
  4. Step 4: Simplify right side
    13,119.47x = 129,477,935.90
  5. Step 5: Solve for x
    x = 129,477,935.90/13,119.47
  6. Step 6: Final answer
    x = 9,869.14

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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.