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Finding the Fourth Proportional to 457,978.20, 686,967.30 and 394,992.60

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Solution

The fourth proportional to 457,978.20, 686,967.30 and 394,992.60 is: 592,488.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,978.20 : 686,967.30 = 394,992.60 : x
  2. Step 2: Convert to fraction form
    457,978.20/686,967.30 = 394,992.60/x
  3. Step 3: Cross multiply
    457,978.20x = 686,967.30 × 394,992.60
  4. Step 4: Simplify right side
    457,978.20x = 271,346,999,941.98
  5. Step 5: Solve for x
    x = 271,346,999,941.98/457,978.20
  6. Step 6: Final answer
    x = 592,488.90

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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.