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Finding the Fourth Proportional to 103,940.60, 155,910.90 and 64,542.20

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Solution

The fourth proportional to 103,940.60, 155,910.90 and 64,542.20 is: 96,813.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,940.60 : 155,910.90 = 64,542.20 : x
  2. Step 2: Convert to fraction form
    103,940.60/155,910.90 = 64,542.20/x
  3. Step 3: Cross multiply
    103,940.60x = 155,910.90 × 64,542.20
  4. Step 4: Simplify right side
    103,940.60x = 10,062,832,489.98
  5. Step 5: Solve for x
    x = 10,062,832,489.98/103,940.60
  6. Step 6: Final answer
    x = 96,813.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.