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Finding the Fourth Proportional to 123,039.60, 172,722 and 123,039.60

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Solution

The fourth proportional to 123,039.60, 172,722 and 123,039.60 is: 172,722

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,039.60 : 172,722 = 123,039.60 : x
  2. Step 2: Convert to fraction form
    123,039.60/172,722 = 123,039.60/x
  3. Step 3: Cross multiply
    123,039.60x = 172,722 × 123,039.60
  4. Step 4: Simplify right side
    123,039.60x = 21,251,645,791.20
  5. Step 5: Solve for x
    x = 21,251,645,791.20/123,039.60
  6. Step 6: Final answer
    x = 172,722

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.