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Finding the Fourth Proportional to 3,987.45, 5,982.45 and 1,214.65

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Solution

The fourth proportional to 3,987.45, 5,982.45 and 1,214.65 is: 1,822.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.45 : 5,982.45 = 1,214.65 : x
  2. Step 2: Convert to fraction form
    3,987.45/5,982.45 = 1,214.65/x
  3. Step 3: Cross multiply
    3,987.45x = 5,982.45 × 1,214.65
  4. Step 4: Simplify right side
    3,987.45x = 7,266,582.89
  5. Step 5: Solve for x
    x = 7,266,582.89/3,987.45
  6. Step 6: Final answer
    x = 1,822.36

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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.