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Finding the Fourth Proportional to 6,490.20, 9,728.10 and 2,791.80

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Solution

The fourth proportional to 6,490.20, 9,728.10 and 2,791.80 is: 4,184.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,490.20 : 9,728.10 = 2,791.80 : x
  2. Step 2: Convert to fraction form
    6,490.20/9,728.10 = 2,791.80/x
  3. Step 3: Cross multiply
    6,490.20x = 9,728.10 × 2,791.80
  4. Step 4: Simplify right side
    6,490.20x = 27,158,909.58
  5. Step 5: Solve for x
    x = 27,158,909.58/6,490.20
  6. Step 6: Final answer
    x = 4,184.60

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1.5x scale

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.