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Finding the Fourth Proportional to 90,813.40, 135,960.90 and 88,221.40

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Solution

The fourth proportional to 90,813.40, 135,960.90 and 88,221.40 is: 132,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,813.40 : 135,960.90 = 88,221.40 : x
  2. Step 2: Convert to fraction form
    90,813.40/135,960.90 = 88,221.40/x
  3. Step 3: Cross multiply
    90,813.40x = 135,960.90 × 88,221.40
  4. Step 4: Simplify right side
    90,813.40x = 11,994,660,943.26
  5. Step 5: Solve for x
    x = 11,994,660,943.26/90,813.40
  6. Step 6: Final answer
    x = 132,080.30

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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.