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Finding the Fourth Proportional to 100,879.70, 139,227.33 and 65,173.58

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Solution

The fourth proportional to 100,879.70, 139,227.33 and 65,173.58 is: 89,948.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,879.70 : 139,227.33 = 65,173.58 : x
  2. Step 2: Convert to fraction form
    100,879.70/139,227.33 = 65,173.58/x
  3. Step 3: Cross multiply
    100,879.70x = 139,227.33 × 65,173.58
  4. Step 4: Simplify right side
    100,879.70x = 9,073,942,833.80
  5. Step 5: Solve for x
    x = 9,073,942,833.80/100,879.70
  6. Step 6: Final answer
    x = 89,948.16

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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.