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Finding the Fourth Proportional to 100,879.92, 139,243.32 and 67,443.12

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Solution

The fourth proportional to 100,879.92, 139,243.32 and 67,443.12 is: 93,090.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,879.92 : 139,243.32 = 67,443.12 : x
  2. Step 2: Convert to fraction form
    100,879.92/139,243.32 = 67,443.12/x
  3. Step 3: Cross multiply
    100,879.92x = 139,243.32 × 67,443.12
  4. Step 4: Simplify right side
    100,879.92x = 9,391,003,939.96
  5. Step 5: Solve for x
    x = 9,391,003,939.96/100,879.92
  6. Step 6: Final answer
    x = 93,090.91

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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.