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Finding the Fourth Proportional to 121,917.28, 168,259.80 and 68,215.90

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Solution

The fourth proportional to 121,917.28, 168,259.80 and 68,215.90 is: 94,145.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,917.28 : 168,259.80 = 68,215.90 : x
  2. Step 2: Convert to fraction form
    121,917.28/168,259.80 = 68,215.90/x
  3. Step 3: Cross multiply
    121,917.28x = 168,259.80 × 68,215.90
  4. Step 4: Simplify right side
    121,917.28x = 11,477,993,690.82
  5. Step 5: Solve for x
    x = 11,477,993,690.82/121,917.28
  6. Step 6: Final answer
    x = 94,145.75

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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.