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Finding the Fourth Proportional to 3,643.28, 5,027.74 and 1,987.28

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Solution

The fourth proportional to 3,643.28, 5,027.74 and 1,987.28 is: 2,742.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,643.28 : 5,027.74 = 1,987.28 : x
  2. Step 2: Convert to fraction form
    3,643.28/5,027.74 = 1,987.28/x
  3. Step 3: Cross multiply
    3,643.28x = 5,027.74 × 1,987.28
  4. Step 4: Simplify right side
    3,643.28x = 9,991,527.15
  5. Step 5: Solve for x
    x = 9,991,527.15/3,643.28
  6. Step 6: Final answer
    x = 2,742.45

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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.