Home / 100,309.47-138,426.20-54,989.97

Finding the Fourth Proportional to 100,309.47, 138,426.20 and 54,989.97

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Solution

The fourth proportional to 100,309.47, 138,426.20 and 54,989.97 is: 75,885.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,309.47 : 138,426.20 = 54,989.97 : x
  2. Step 2: Convert to fraction form
    100,309.47/138,426.20 = 54,989.97/x
  3. Step 3: Cross multiply
    100,309.47x = 138,426.20 × 54,989.97
  4. Step 4: Simplify right side
    100,309.47x = 7,612,052,310.26
  5. Step 5: Solve for x
    x = 7,612,052,310.26/100,309.47
  6. Step 6: Final answer
    x = 75,885.68

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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.