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Finding the Fourth Proportional to 121,812.78, 168,116.16 and 71,511.78

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Solution

The fourth proportional to 121,812.78, 168,116.16 and 71,511.78 is: 98,694.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,812.78 : 168,116.16 = 71,511.78 : x
  2. Step 2: Convert to fraction form
    121,812.78/168,116.16 = 71,511.78/x
  3. Step 3: Cross multiply
    121,812.78x = 168,116.16 × 71,511.78
  4. Step 4: Simplify right side
    121,812.78x = 12,022,285,848.36
  5. Step 5: Solve for x
    x = 12,022,285,848.36/121,812.78
  6. Step 6: Final answer
    x = 98,694.78

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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.