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Finding the Fourth Proportional to 121,978.19, 168,332.19 and 68,269.12

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Solution

The fourth proportional to 121,978.19, 168,332.19 and 68,269.12 is: 94,212.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,978.19 : 168,332.19 = 68,269.12 : x
  2. Step 2: Convert to fraction form
    121,978.19/168,332.19 = 68,269.12/x
  3. Step 3: Cross multiply
    121,978.19x = 168,332.19 × 68,269.12
  4. Step 4: Simplify right side
    121,978.19x = 11,491,890,478.97
  5. Step 5: Solve for x
    x = 11,491,890,478.97/121,978.19
  6. Step 6: Final answer
    x = 94,212.67

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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.