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Finding the Fourth Proportional to 3,978.06, 5,967.09 and 1,381.20

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Solution

The fourth proportional to 3,978.06, 5,967.09 and 1,381.20 is: 2,071.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.06 : 5,967.09 = 1,381.20 : x
  2. Step 2: Convert to fraction form
    3,978.06/5,967.09 = 1,381.20/x
  3. Step 3: Cross multiply
    3,978.06x = 5,967.09 × 1,381.20
  4. Step 4: Simplify right side
    3,978.06x = 8,241,744.71
  5. Step 5: Solve for x
    x = 8,241,744.71/3,978.06
  6. Step 6: Final answer
    x = 2,071.80

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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.