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Finding the Fourth Proportional to 100,665.44, 138,919.24 and 55,343.74

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Solution

The fourth proportional to 100,665.44, 138,919.24 and 55,343.74 is: 76,374.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,665.44 : 138,919.24 = 55,343.74 : x
  2. Step 2: Convert to fraction form
    100,665.44/138,919.24 = 55,343.74/x
  3. Step 3: Cross multiply
    100,665.44x = 138,919.24 × 55,343.74
  4. Step 4: Simplify right side
    100,665.44x = 7,688,309,813.90
  5. Step 5: Solve for x
    x = 7,688,309,813.90/100,665.44
  6. Step 6: Final answer
    x = 76,374.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.