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Finding the Fourth Proportional to 100,348.80, 138,480.19 and 57,906.42

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Solution

The fourth proportional to 100,348.80, 138,480.19 and 57,906.42 is: 79,910.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,348.80 : 138,480.19 = 57,906.42 : x
  2. Step 2: Convert to fraction form
    100,348.80/138,480.19 = 57,906.42/x
  3. Step 3: Cross multiply
    100,348.80x = 138,480.19 × 57,906.42
  4. Step 4: Simplify right side
    100,348.80x = 8,018,892,043.82
  5. Step 5: Solve for x
    x = 8,018,892,043.82/100,348.80
  6. Step 6: Final answer
    x = 79,910.19

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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.