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Finding the Fourth Proportional to 8,679.90, 11,978.19 and 4,701

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Solution

The fourth proportional to 8,679.90, 11,978.19 and 4,701 is: 6,487.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.90 : 11,978.19 = 4,701 : x
  2. Step 2: Convert to fraction form
    8,679.90/11,978.19 = 4,701/x
  3. Step 3: Cross multiply
    8,679.90x = 11,978.19 × 4,701
  4. Step 4: Simplify right side
    8,679.90x = 56,309,471.19
  5. Step 5: Solve for x
    x = 56,309,471.19/8,679.90
  6. Step 6: Final answer
    x = 6,487.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.