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Finding the Fourth Proportional to 8,659.81, 12,985.62 and 3,110.95

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Solution

The fourth proportional to 8,659.81, 12,985.62 and 3,110.95 is: 4,664.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.81 : 12,985.62 = 3,110.95 : x
  2. Step 2: Convert to fraction form
    8,659.81/12,985.62 = 3,110.95/x
  3. Step 3: Cross multiply
    8,659.81x = 12,985.62 × 3,110.95
  4. Step 4: Simplify right side
    8,659.81x = 40,397,614.54
  5. Step 5: Solve for x
    x = 40,397,614.54/8,659.81
  6. Step 6: Final answer
    x = 4,664.95

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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.