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Finding the Fourth Proportional to 8,687.72, 11,989.11 and 4,708.90

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Solution

The fourth proportional to 8,687.72, 11,989.11 and 4,708.90 is: 6,498.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.72 : 11,989.11 = 4,708.90 : x
  2. Step 2: Convert to fraction form
    8,687.72/11,989.11 = 4,708.90/x
  3. Step 3: Cross multiply
    8,687.72x = 11,989.11 × 4,708.90
  4. Step 4: Simplify right side
    8,687.72x = 56,455,460.13
  5. Step 5: Solve for x
    x = 56,455,460.13/8,687.72
  6. Step 6: Final answer
    x = 6,498.31

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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.