Home / 100,442.28-138,609.06-55,120.68

Finding the Fourth Proportional to 100,442.28, 138,609.06 and 55,120.68

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Solution

The fourth proportional to 100,442.28, 138,609.06 and 55,120.68 is: 76,065.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,442.28 : 138,609.06 = 55,120.68 : x
  2. Step 2: Convert to fraction form
    100,442.28/138,609.06 = 55,120.68/x
  3. Step 3: Cross multiply
    100,442.28x = 138,609.06 × 55,120.68
  4. Step 4: Simplify right side
    100,442.28x = 7,640,225,641.36
  5. Step 5: Solve for x
    x = 7,640,225,641.36/100,442.28
  6. Step 6: Final answer
    x = 76,065.83

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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.