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Finding the Fourth Proportional to 121,719.49, 168,019.78 and 108,950.15

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Solution

The fourth proportional to 121,719.49, 168,019.78 and 108,950.15 is: 150,393.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,719.49 : 168,019.78 = 108,950.15 : x
  2. Step 2: Convert to fraction form
    121,719.49/168,019.78 = 108,950.15/x
  3. Step 3: Cross multiply
    121,719.49x = 168,019.78 × 108,950.15
  4. Step 4: Simplify right side
    121,719.49x = 18,305,779,360.69
  5. Step 5: Solve for x
    x = 18,305,779,360.69/121,719.49
  6. Step 6: Final answer
    x = 150,393.16

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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.