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Finding the Fourth Proportional to 90,612.80, 135,919.20 and 82,302.20

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Solution

The fourth proportional to 90,612.80, 135,919.20 and 82,302.20 is: 123,453.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,612.80 : 135,919.20 = 82,302.20 : x
  2. Step 2: Convert to fraction form
    90,612.80/135,919.20 = 82,302.20/x
  3. Step 3: Cross multiply
    90,612.80x = 135,919.20 × 82,302.20
  4. Step 4: Simplify right side
    90,612.80x = 11,186,449,182.24
  5. Step 5: Solve for x
    x = 11,186,449,182.24/90,612.80
  6. Step 6: Final answer
    x = 123,453.30

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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.