Home / 100,440.09-138,572.99-57,388.69

Finding the Fourth Proportional to 100,440.09, 138,572.99 and 57,388.69

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Solution

The fourth proportional to 100,440.09, 138,572.99 and 57,388.69 is: 79,176.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,440.09 : 138,572.99 = 57,388.69 : x
  2. Step 2: Convert to fraction form
    100,440.09/138,572.99 = 57,388.69/x
  3. Step 3: Cross multiply
    100,440.09x = 138,572.99 × 57,388.69
  4. Step 4: Simplify right side
    100,440.09x = 7,952,522,789.77
  5. Step 5: Solve for x
    x = 7,952,522,789.77/100,440.09
  6. Step 6: Final answer
    x = 79,176.78

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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.