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Finding the Fourth Proportional to 483,981.90, 667,978.62 and 280,145.21

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Solution

The fourth proportional to 483,981.90, 667,978.62 and 280,145.21 is: 386,648.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    483,981.90 : 667,978.62 = 280,145.21 : x
  2. Step 2: Convert to fraction form
    483,981.90/667,978.62 = 280,145.21/x
  3. Step 3: Cross multiply
    483,981.90x = 667,978.62 × 280,145.21
  4. Step 4: Simplify right side
    483,981.90x = 187,131,008,889.89
  5. Step 5: Solve for x
    x = 187,131,008,889.89/483,981.90
  6. Step 6: Final answer
    x = 386,648.78

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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.