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Finding the Fourth Proportional to 90,668.60, 135,870.10 and 81,308.60

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Solution

The fourth proportional to 90,668.60, 135,870.10 and 81,308.60 is: 121,843.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,668.60 : 135,870.10 = 81,308.60 : x
  2. Step 2: Convert to fraction form
    90,668.60/135,870.10 = 81,308.60/x
  3. Step 3: Cross multiply
    90,668.60x = 135,870.10 × 81,308.60
  4. Step 4: Simplify right side
    90,668.60x = 11,047,407,612.86
  5. Step 5: Solve for x
    x = 11,047,407,612.86/90,668.60
  6. Step 6: Final answer
    x = 121,843.81

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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.