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Finding the Fourth Proportional to 123,879.42, 170,949.69 and 70,169.40

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Solution

The fourth proportional to 123,879.42, 170,949.69 and 70,169.40 is: 96,831.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,879.42 : 170,949.69 = 70,169.40 : x
  2. Step 2: Convert to fraction form
    123,879.42/170,949.69 = 70,169.40/x
  3. Step 3: Cross multiply
    123,879.42x = 170,949.69 × 70,169.40
  4. Step 4: Simplify right side
    123,879.42x = 11,995,437,177.49
  5. Step 5: Solve for x
    x = 11,995,437,177.49/123,879.42
  6. Step 6: Final answer
    x = 96,831.56

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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.