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Finding the Fourth Proportional to 612,593.28, 918,889.92 and 279,936

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Solution

The fourth proportional to 612,593.28, 918,889.92 and 279,936 is: 419,904

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,593.28 : 918,889.92 = 279,936 : x
  2. Step 2: Convert to fraction form
    612,593.28/918,889.92 = 279,936/x
  3. Step 3: Cross multiply
    612,593.28x = 918,889.92 × 279,936
  4. Step 4: Simplify right side
    612,593.28x = 257,230,368,645.12
  5. Step 5: Solve for x
    x = 257,230,368,645.12/612,593.28
  6. Step 6: Final answer
    x = 419,904

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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.