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Finding the Fourth Proportional to 3,987.28, 5,981.14 and 1,214.04

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Solution

The fourth proportional to 3,987.28, 5,981.14 and 1,214.04 is: 1,821.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.28 : 5,981.14 = 1,214.04 : x
  2. Step 2: Convert to fraction form
    3,987.28/5,981.14 = 1,214.04/x
  3. Step 3: Cross multiply
    3,987.28x = 5,981.14 × 1,214.04
  4. Step 4: Simplify right side
    3,987.28x = 7,261,343.21
  5. Step 5: Solve for x
    x = 7,261,343.21/3,987.28
  6. Step 6: Final answer
    x = 1,821.13

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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.