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Finding the Fourth Proportional to 108,908.40, 163,362.60 and 68,959.20

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Solution

The fourth proportional to 108,908.40, 163,362.60 and 68,959.20 is: 103,438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,908.40 : 163,362.60 = 68,959.20 : x
  2. Step 2: Convert to fraction form
    108,908.40/163,362.60 = 68,959.20/x
  3. Step 3: Cross multiply
    108,908.40x = 163,362.60 × 68,959.20
  4. Step 4: Simplify right side
    108,908.40x = 11,265,354,205.92
  5. Step 5: Solve for x
    x = 11,265,354,205.92/108,908.40
  6. Step 6: Final answer
    x = 103,438.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.