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Finding the Fourth Proportional to 3,726.25, 5,589.38 and 990.25

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Solution

The fourth proportional to 3,726.25, 5,589.38 and 990.25 is: 1,485.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,726.25 : 5,589.38 = 990.25 : x
  2. Step 2: Convert to fraction form
    3,726.25/5,589.38 = 990.25/x
  3. Step 3: Cross multiply
    3,726.25x = 5,589.38 × 990.25
  4. Step 4: Simplify right side
    3,726.25x = 5,534,883.55
  5. Step 5: Solve for x
    x = 5,534,883.55/3,726.25
  6. Step 6: Final answer
    x = 1,485.38

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Similar ratio
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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.