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Finding the Fourth Proportional to 121,781.37, 168,057.72 and 68,066.31

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Solution

The fourth proportional to 121,781.37, 168,057.72 and 68,066.31 is: 93,931.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,781.37 : 168,057.72 = 68,066.31 : x
  2. Step 2: Convert to fraction form
    121,781.37/168,057.72 = 68,066.31/x
  3. Step 3: Cross multiply
    121,781.37x = 168,057.72 × 68,066.31
  4. Step 4: Simplify right side
    121,781.37x = 11,439,068,867.41
  5. Step 5: Solve for x
    x = 11,439,068,867.41/121,781.37
  6. Step 6: Final answer
    x = 93,931.19

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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.