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Finding the Fourth Proportional to 90,613.20, 135,660.60 and 55,621.20

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Solution

The fourth proportional to 90,613.20, 135,660.60 and 55,621.20 is: 83,272.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,613.20 : 135,660.60 = 55,621.20 : x
  2. Step 2: Convert to fraction form
    90,613.20/135,660.60 = 55,621.20/x
  3. Step 3: Cross multiply
    90,613.20x = 135,660.60 × 55,621.20
  4. Step 4: Simplify right side
    90,613.20x = 7,545,605,364.72
  5. Step 5: Solve for x
    x = 7,545,605,364.72/90,613.20
  6. Step 6: Final answer
    x = 83,272.69

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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.