Home / 81,399.48-112,221-69,589.68

Finding the Fourth Proportional to 81,399.48, 112,221 and 69,589.68

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Solution

The fourth proportional to 81,399.48, 112,221 and 69,589.68 is: 95,939.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,399.48 : 112,221 = 69,589.68 : x
  2. Step 2: Convert to fraction form
    81,399.48/112,221 = 69,589.68/x
  3. Step 3: Cross multiply
    81,399.48x = 112,221 × 69,589.68
  4. Step 4: Simplify right side
    81,399.48x = 7,809,423,479.28
  5. Step 5: Solve for x
    x = 7,809,423,479.28/81,399.48
  6. Step 6: Final answer
    x = 95,939.48

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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.