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Finding the Fourth Proportional to 79,138.40, 109,285 and 50,893.12

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Solution

The fourth proportional to 79,138.40, 109,285 and 50,893.12 is: 70,280.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,138.40 : 109,285 = 50,893.12 : x
  2. Step 2: Convert to fraction form
    79,138.40/109,285 = 50,893.12/x
  3. Step 3: Cross multiply
    79,138.40x = 109,285 × 50,893.12
  4. Step 4: Simplify right side
    79,138.40x = 5,561,854,619.20
  5. Step 5: Solve for x
    x = 5,561,854,619.20/79,138.40
  6. Step 6: Final answer
    x = 70,280.10

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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.