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Finding the Fourth Proportional to 107,919.80, 161,879.70 and 90,423.80

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Solution

The fourth proportional to 107,919.80, 161,879.70 and 90,423.80 is: 135,635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,919.80 : 161,879.70 = 90,423.80 : x
  2. Step 2: Convert to fraction form
    107,919.80/161,879.70 = 90,423.80/x
  3. Step 3: Cross multiply
    107,919.80x = 161,879.70 × 90,423.80
  4. Step 4: Simplify right side
    107,919.80x = 14,637,777,616.86
  5. Step 5: Solve for x
    x = 14,637,777,616.86/107,919.80
  6. Step 6: Final answer
    x = 135,635.70

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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.