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Finding the Fourth Proportional to 121,978.16, 168,330.70 and 68,268.16

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Solution

The fourth proportional to 121,978.16, 168,330.70 and 68,268.16 is: 94,210.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,978.16 : 168,330.70 = 68,268.16 : x
  2. Step 2: Convert to fraction form
    121,978.16/168,330.70 = 68,268.16/x
  3. Step 3: Cross multiply
    121,978.16x = 168,330.70 × 68,268.16
  4. Step 4: Simplify right side
    121,978.16x = 11,491,627,160.51
  5. Step 5: Solve for x
    x = 11,491,627,160.51/121,978.16
  6. Step 6: Final answer
    x = 94,210.53

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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.