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Finding the Fourth Proportional to 3,978.90, 5,968.62 and 1,057.14

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Solution

The fourth proportional to 3,978.90, 5,968.62 and 1,057.14 is: 1,585.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.90 : 5,968.62 = 1,057.14 : x
  2. Step 2: Convert to fraction form
    3,978.90/5,968.62 = 1,057.14/x
  3. Step 3: Cross multiply
    3,978.90x = 5,968.62 × 1,057.14
  4. Step 4: Simplify right side
    3,978.90x = 6,309,666.95
  5. Step 5: Solve for x
    x = 6,309,666.95/3,978.90
  6. Step 6: Final answer
    x = 1,585.78

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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.