Home / 100,299.12-138,412.26-54,979.02

Finding the Fourth Proportional to 100,299.12, 138,412.26 and 54,979.02

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Solution

The fourth proportional to 100,299.12, 138,412.26 and 54,979.02 is: 75,870.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,299.12 : 138,412.26 = 54,979.02 : x
  2. Step 2: Convert to fraction form
    100,299.12/138,412.26 = 54,979.02/x
  3. Step 3: Cross multiply
    100,299.12x = 138,412.26 × 54,979.02
  4. Step 4: Simplify right side
    100,299.12x = 7,609,770,410.79
  5. Step 5: Solve for x
    x = 7,609,770,410.79/100,299.12
  6. Step 6: Final answer
    x = 75,870.76

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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.