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Finding the Fourth Proportional to 3,643.60, 5,028.06 and 1,987.60

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Solution

The fourth proportional to 3,643.60, 5,028.06 and 1,987.60 is: 2,742.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,643.60 : 5,028.06 = 1,987.60 : x
  2. Step 2: Convert to fraction form
    3,643.60/5,028.06 = 1,987.60/x
  3. Step 3: Cross multiply
    3,643.60x = 5,028.06 × 1,987.60
  4. Step 4: Simplify right side
    3,643.60x = 9,993,772.06
  5. Step 5: Solve for x
    x = 9,993,772.06/3,643.60
  6. Step 6: Final answer
    x = 2,742.83

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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.