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Finding the Fourth Proportional to 8,165.40, 11,270.79 and 6,489.78

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Solution

The fourth proportional to 8,165.40, 11,270.79 and 6,489.78 is: 8,957.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,165.40 : 11,270.79 = 6,489.78 : x
  2. Step 2: Convert to fraction form
    8,165.40/11,270.79 = 6,489.78/x
  3. Step 3: Cross multiply
    8,165.40x = 11,270.79 × 6,489.78
  4. Step 4: Simplify right side
    8,165.40x = 73,144,947.53
  5. Step 5: Solve for x
    x = 73,144,947.53/8,165.40
  6. Step 6: Final answer
    x = 8,957.91

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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.