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Finding the Fourth Proportional to 8,689.74, 11,991.81 and 4,710.85

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Solution

The fourth proportional to 8,689.74, 11,991.81 and 4,710.85 is: 6,500.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.74 : 11,991.81 = 4,710.85 : x
  2. Step 2: Convert to fraction form
    8,689.74/11,991.81 = 4,710.85/x
  3. Step 3: Cross multiply
    8,689.74x = 11,991.81 × 4,710.85
  4. Step 4: Simplify right side
    8,689.74x = 56,491,618.14
  5. Step 5: Solve for x
    x = 56,491,618.14/8,689.74
  6. Step 6: Final answer
    x = 6,500.96

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1.5x scale

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.