Home / 86,139.12-129,208.68-26,979.42

Finding the Fourth Proportional to 86,139.12, 129,208.68 and 26,979.42

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Solution

The fourth proportional to 86,139.12, 129,208.68 and 26,979.42 is: 40,469.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,139.12 : 129,208.68 = 26,979.42 : x
  2. Step 2: Convert to fraction form
    86,139.12/129,208.68 = 26,979.42/x
  3. Step 3: Cross multiply
    86,139.12x = 129,208.68 × 26,979.42
  4. Step 4: Simplify right side
    86,139.12x = 3,485,975,245.37
  5. Step 5: Solve for x
    x = 3,485,975,245.37/86,139.12
  6. Step 6: Final answer
    x = 40,469.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.