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Finding the Fourth Proportional to 100,439.98, 138,601.20 and 57,424.12

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Solution

The fourth proportional to 100,439.98, 138,601.20 and 57,424.12 is: 79,241.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,439.98 : 138,601.20 = 57,424.12 : x
  2. Step 2: Convert to fraction form
    100,439.98/138,601.20 = 57,424.12/x
  3. Step 3: Cross multiply
    100,439.98x = 138,601.20 × 57,424.12
  4. Step 4: Simplify right side
    100,439.98x = 7,959,051,940.94
  5. Step 5: Solve for x
    x = 7,959,051,940.94/100,439.98
  6. Step 6: Final answer
    x = 79,241.87

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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.