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Finding the Fourth Proportional to 8,659.60, 12,991.80 and 5,743.60

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Solution

The fourth proportional to 8,659.60, 12,991.80 and 5,743.60 is: 8,616.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.60 : 12,991.80 = 5,743.60 : x
  2. Step 2: Convert to fraction form
    8,659.60/12,991.80 = 5,743.60/x
  3. Step 3: Cross multiply
    8,659.60x = 12,991.80 × 5,743.60
  4. Step 4: Simplify right side
    8,659.60x = 74,619,702.48
  5. Step 5: Solve for x
    x = 74,619,702.48/8,659.60
  6. Step 6: Final answer
    x = 8,616.99

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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.