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Finding the Fourth Proportional to 88,646.40, 132,969.60 and 81,388.80

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Solution

The fourth proportional to 88,646.40, 132,969.60 and 81,388.80 is: 122,083.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,646.40 : 132,969.60 = 81,388.80 : x
  2. Step 2: Convert to fraction form
    88,646.40/132,969.60 = 81,388.80/x
  3. Step 3: Cross multiply
    88,646.40x = 132,969.60 × 81,388.80
  4. Step 4: Simplify right side
    88,646.40x = 10,822,236,180.48
  5. Step 5: Solve for x
    x = 10,822,236,180.48/88,646.40
  6. Step 6: Final answer
    x = 122,083.20

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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.