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Finding the Fourth Proportional to 121,812.64, 168,102.69 and 68,100.64

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Solution

The fourth proportional to 121,812.64, 168,102.69 and 68,100.64 is: 93,979.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,812.64 : 168,102.69 = 68,100.64 : x
  2. Step 2: Convert to fraction form
    121,812.64/168,102.69 = 68,100.64/x
  3. Step 3: Cross multiply
    121,812.64x = 168,102.69 × 68,100.64
  4. Step 4: Simplify right side
    121,812.64x = 11,447,900,774.72
  5. Step 5: Solve for x
    x = 11,447,900,774.72/121,812.64
  6. Step 6: Final answer
    x = 93,979.58

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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.