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Finding the Fourth Proportional to 90,581.90, 135,918 and 40,697.64

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Solution

The fourth proportional to 90,581.90, 135,918 and 40,697.64 is: 61,066.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,581.90 : 135,918 = 40,697.64 : x
  2. Step 2: Convert to fraction form
    90,581.90/135,918 = 40,697.64/x
  3. Step 3: Cross multiply
    90,581.90x = 135,918 × 40,697.64
  4. Step 4: Simplify right side
    90,581.90x = 5,531,541,833.52
  5. Step 5: Solve for x
    x = 5,531,541,833.52/90,581.90
  6. Step 6: Final answer
    x = 61,066.75

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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.