Home / 100,817.56-139,111.97-57,789.15

Finding the Fourth Proportional to 100,817.56, 139,111.97 and 57,789.15

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Solution

The fourth proportional to 100,817.56, 139,111.97 and 57,789.15 is: 79,739.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,817.56 : 139,111.97 = 57,789.15 : x
  2. Step 2: Convert to fraction form
    100,817.56/139,111.97 = 57,789.15/x
  3. Step 3: Cross multiply
    100,817.56x = 139,111.97 × 57,789.15
  4. Step 4: Simplify right side
    100,817.56x = 8,039,161,690.51
  5. Step 5: Solve for x
    x = 8,039,161,690.51/100,817.56
  6. Step 6: Final answer
    x = 79,739.70

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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.