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Finding the Fourth Proportional to 89,940.80, 134,911.20 and 86,101.40

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Solution

The fourth proportional to 89,940.80, 134,911.20 and 86,101.40 is: 129,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,940.80 : 134,911.20 = 86,101.40 : x
  2. Step 2: Convert to fraction form
    89,940.80/134,911.20 = 86,101.40/x
  3. Step 3: Cross multiply
    89,940.80x = 134,911.20 × 86,101.40
  4. Step 4: Simplify right side
    89,940.80x = 11,616,043,195.68
  5. Step 5: Solve for x
    x = 11,616,043,195.68/89,940.80
  6. Step 6: Final answer
    x = 129,152.10

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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.