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Finding the Fourth Proportional to 69,781.87, 96,301.52 and 39,979.63

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Solution

The fourth proportional to 69,781.87, 96,301.52 and 39,979.63 is: 55,173.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,781.87 : 96,301.52 = 39,979.63 : x
  2. Step 2: Convert to fraction form
    69,781.87/96,301.52 = 39,979.63/x
  3. Step 3: Cross multiply
    69,781.87x = 96,301.52 × 39,979.63
  4. Step 4: Simplify right side
    69,781.87x = 3,850,099,138.04
  5. Step 5: Solve for x
    x = 3,850,099,138.04/69,781.87
  6. Step 6: Final answer
    x = 55,173.34

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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.