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Finding the Fourth Proportional to 3,456.80, 5,183.64 and 991.06

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Solution

The fourth proportional to 3,456.80, 5,183.64 and 991.06 is: 1,486.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,456.80 : 5,183.64 = 991.06 : x
  2. Step 2: Convert to fraction form
    3,456.80/5,183.64 = 991.06/x
  3. Step 3: Cross multiply
    3,456.80x = 5,183.64 × 991.06
  4. Step 4: Simplify right side
    3,456.80x = 5,137,298.26
  5. Step 5: Solve for x
    x = 5,137,298.26/3,456.80
  6. Step 6: Final answer
    x = 1,486.14

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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.