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Finding the Fourth Proportional to 306,279, 422,665.02 and 172,143

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Solution

The fourth proportional to 306,279, 422,665.02 and 172,143 is: 237,557.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,279 : 422,665.02 = 172,143 : x
  2. Step 2: Convert to fraction form
    306,279/422,665.02 = 172,143/x
  3. Step 3: Cross multiply
    306,279x = 422,665.02 × 172,143
  4. Step 4: Simplify right side
    306,279x = 72,758,824,537.86
  5. Step 5: Solve for x
    x = 72,758,824,537.86/306,279
  6. Step 6: Final answer
    x = 237,557.34

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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.