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Finding the Fourth Proportional to 639,861.47, 959,967.53 and 279,967.07

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Solution

The fourth proportional to 639,861.47, 959,967.53 and 279,967.07 is: 420,027.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,861.47 : 959,967.53 = 279,967.07 : x
  2. Step 2: Convert to fraction form
    639,861.47/959,967.53 = 279,967.07/x
  3. Step 3: Cross multiply
    639,861.47x = 959,967.53 × 279,967.07
  4. Step 4: Simplify right side
    639,861.47x = 268,759,299,769.07
  5. Step 5: Solve for x
    x = 268,759,299,769.07/639,861.47
  6. Step 6: Final answer
    x = 420,027.33

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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.