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Finding the Fourth Proportional to 8,615.80, 11,887.96 and 5,636

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Solution

The fourth proportional to 8,615.80, 11,887.96 and 5,636 is: 7,776.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.80 : 11,887.96 = 5,636 : x
  2. Step 2: Convert to fraction form
    8,615.80/11,887.96 = 5,636/x
  3. Step 3: Cross multiply
    8,615.80x = 11,887.96 × 5,636
  4. Step 4: Simplify right side
    8,615.80x = 67,000,542.56
  5. Step 5: Solve for x
    x = 67,000,542.56/8,615.80
  6. Step 6: Final answer
    x = 7,776.47

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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.