Home / 100,438.92-138,601.02-55,115.76

Finding the Fourth Proportional to 100,438.92, 138,601.02 and 55,115.76

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Solution

The fourth proportional to 100,438.92, 138,601.02 and 55,115.76 is: 76,057.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,438.92 : 138,601.02 = 55,115.76 : x
  2. Step 2: Convert to fraction form
    100,438.92/138,601.02 = 55,115.76/x
  3. Step 3: Cross multiply
    100,438.92x = 138,601.02 × 55,115.76
  4. Step 4: Simplify right side
    100,438.92x = 7,639,100,554.08
  5. Step 5: Solve for x
    x = 7,639,100,554.08/100,438.92
  6. Step 6: Final answer
    x = 76,057.18

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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.