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Finding the Fourth Proportional to 90,615.20, 135,922.80 and 83,616.80

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Solution

The fourth proportional to 90,615.20, 135,922.80 and 83,616.80 is: 125,425.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,615.20 : 135,922.80 = 83,616.80 : x
  2. Step 2: Convert to fraction form
    90,615.20/135,922.80 = 83,616.80/x
  3. Step 3: Cross multiply
    90,615.20x = 135,922.80 × 83,616.80
  4. Step 4: Simplify right side
    90,615.20x = 11,365,429,583.04
  5. Step 5: Solve for x
    x = 11,365,429,583.04/90,615.20
  6. Step 6: Final answer
    x = 125,425.20

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1.5x scale

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.