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Finding the Fourth Proportional to 479,563.20, 661,390.92 and 288,540.90

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Solution

The fourth proportional to 479,563.20, 661,390.92 and 288,540.90 is: 397,941.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,563.20 : 661,390.92 = 288,540.90 : x
  2. Step 2: Convert to fraction form
    479,563.20/661,390.92 = 288,540.90/x
  3. Step 3: Cross multiply
    479,563.20x = 661,390.92 × 288,540.90
  4. Step 4: Simplify right side
    479,563.20x = 190,838,331,308.63
  5. Step 5: Solve for x
    x = 190,838,331,308.63/479,563.20
  6. Step 6: Final answer
    x = 397,941.98

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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.