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Finding the Fourth Proportional to 107,919.60, 161,879.40 and 90,812.40

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Solution

The fourth proportional to 107,919.60, 161,879.40 and 90,812.40 is: 136,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,919.60 : 161,879.40 = 90,812.40 : x
  2. Step 2: Convert to fraction form
    107,919.60/161,879.40 = 90,812.40/x
  3. Step 3: Cross multiply
    107,919.60x = 161,879.40 × 90,812.40
  4. Step 4: Simplify right side
    107,919.60x = 14,700,656,824.56
  5. Step 5: Solve for x
    x = 14,700,656,824.56/107,919.60
  6. Step 6: Final answer
    x = 136,218.60

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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.