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Finding the Fourth Proportional to 100,449.69, 138,626.81 and 66,399.13

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Solution

The fourth proportional to 100,449.69, 138,626.81 and 66,399.13 is: 91,634.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,449.69 : 138,626.81 = 66,399.13 : x
  2. Step 2: Convert to fraction form
    100,449.69/138,626.81 = 66,399.13/x
  3. Step 3: Cross multiply
    100,449.69x = 138,626.81 × 66,399.13
  4. Step 4: Simplify right side
    100,449.69x = 9,204,698,889.18
  5. Step 5: Solve for x
    x = 9,204,698,889.18/100,449.69
  6. Step 6: Final answer
    x = 91,634.92

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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.