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Finding the Fourth Proportional to 512,599.20, 768,898.80 and 138,622.20

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Solution

The fourth proportional to 512,599.20, 768,898.80 and 138,622.20 is: 207,933.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,599.20 : 768,898.80 = 138,622.20 : x
  2. Step 2: Convert to fraction form
    512,599.20/768,898.80 = 138,622.20/x
  3. Step 3: Cross multiply
    512,599.20x = 768,898.80 × 138,622.20
  4. Step 4: Simplify right side
    512,599.20x = 106,586,443,233.36
  5. Step 5: Solve for x
    x = 106,586,443,233.36/512,599.20
  6. Step 6: Final answer
    x = 207,933.30

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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.