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Finding the Fourth Proportional to 6,637.86, 9,157.16 and 3,980.66

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Solution

The fourth proportional to 6,637.86, 9,157.16 and 3,980.66 is: 5,491.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,637.86 : 9,157.16 = 3,980.66 : x
  2. Step 2: Convert to fraction form
    6,637.86/9,157.16 = 3,980.66/x
  3. Step 3: Cross multiply
    6,637.86x = 9,157.16 × 3,980.66
  4. Step 4: Simplify right side
    6,637.86x = 36,451,540.53
  5. Step 5: Solve for x
    x = 36,451,540.53/6,637.86
  6. Step 6: Final answer
    x = 5,491.46

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Half scale
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Double scale
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Similar ratio
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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.