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Finding the Fourth Proportional to 90,756.80, 135,940.80 and 75,204.80

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Solution

The fourth proportional to 90,756.80, 135,940.80 and 75,204.80 is: 112,646.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,756.80 : 135,940.80 = 75,204.80 : x
  2. Step 2: Convert to fraction form
    90,756.80/135,940.80 = 75,204.80/x
  3. Step 3: Cross multiply
    90,756.80x = 135,940.80 × 75,204.80
  4. Step 4: Simplify right side
    90,756.80x = 10,223,400,675.84
  5. Step 5: Solve for x
    x = 10,223,400,675.84/90,756.80
  6. Step 6: Final answer
    x = 112,646.11

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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.