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Finding the Fourth Proportional to 7,985.77, 11,978.66 and 2,142.97

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Solution

The fourth proportional to 7,985.77, 11,978.66 and 2,142.97 is: 3,214.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,985.77 : 11,978.66 = 2,142.97 : x
  2. Step 2: Convert to fraction form
    7,985.77/11,978.66 = 2,142.97/x
  3. Step 3: Cross multiply
    7,985.77x = 11,978.66 × 2,142.97
  4. Step 4: Simplify right side
    7,985.77x = 25,669,898.31
  5. Step 5: Solve for x
    x = 25,669,898.31/7,985.77
  6. Step 6: Final answer
    x = 3,214.46

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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.