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Finding the Fourth Proportional to 6,640.32, 9,164.16 and 3,988.80

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Solution

The fourth proportional to 6,640.32, 9,164.16 and 3,988.80 is: 5,504.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.32 : 9,164.16 = 3,988.80 : x
  2. Step 2: Convert to fraction form
    6,640.32/9,164.16 = 3,988.80/x
  3. Step 3: Cross multiply
    6,640.32x = 9,164.16 × 3,988.80
  4. Step 4: Simplify right side
    6,640.32x = 36,554,001.41
  5. Step 5: Solve for x
    x = 36,554,001.41/6,640.32
  6. Step 6: Final answer
    x = 5,504.86

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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.