Home / 100,329.12-138,138.48-76,379.04

Finding the Fourth Proportional to 100,329.12, 138,138.48 and 76,379.04

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Solution

The fourth proportional to 100,329.12, 138,138.48 and 76,379.04 is: 105,162.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,329.12 : 138,138.48 = 76,379.04 : x
  2. Step 2: Convert to fraction form
    100,329.12/138,138.48 = 76,379.04/x
  3. Step 3: Cross multiply
    100,329.12x = 138,138.48 × 76,379.04
  4. Step 4: Simplify right side
    100,329.12x = 10,550,884,489.46
  5. Step 5: Solve for x
    x = 10,550,884,489.46/100,329.12
  6. Step 6: Final answer
    x = 105,162.73

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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.