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Finding the Fourth Proportional to 7,134.48, 9,845.80 and 3,990.80

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Solution

The fourth proportional to 7,134.48, 9,845.80 and 3,990.80 is: 5,507.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,134.48 : 9,845.80 = 3,990.80 : x
  2. Step 2: Convert to fraction form
    7,134.48/9,845.80 = 3,990.80/x
  3. Step 3: Cross multiply
    7,134.48x = 9,845.80 × 3,990.80
  4. Step 4: Simplify right side
    7,134.48x = 39,292,618.64
  5. Step 5: Solve for x
    x = 39,292,618.64/7,134.48
  6. Step 6: Final answer
    x = 5,507.43

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1.5x scale

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.