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Finding the Fourth Proportional to 8,685, 11,991.06 and 5,378.76

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Solution

The fourth proportional to 8,685, 11,991.06 and 5,378.76 is: 7,426.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685 : 11,991.06 = 5,378.76 : x
  2. Step 2: Convert to fraction form
    8,685/11,991.06 = 5,378.76/x
  3. Step 3: Cross multiply
    8,685x = 11,991.06 × 5,378.76
  4. Step 4: Simplify right side
    8,685x = 64,497,033.89
  5. Step 5: Solve for x
    x = 64,497,033.89/8,685
  6. Step 6: Final answer
    x = 7,426.26

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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.