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Finding the Fourth Proportional to 490,639.90, 676,983.82 and 286,651.43

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Solution

The fourth proportional to 490,639.90, 676,983.82 and 286,651.43 is: 395,520.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    490,639.90 : 676,983.82 = 286,651.43 : x
  2. Step 2: Convert to fraction form
    490,639.90/676,983.82 = 286,651.43/x
  3. Step 3: Cross multiply
    490,639.90x = 676,983.82 × 286,651.43
  4. Step 4: Simplify right side
    490,639.90x = 194,058,380,089.86
  5. Step 5: Solve for x
    x = 194,058,380,089.86/490,639.90
  6. Step 6: Final answer
    x = 395,520.99

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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.