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Finding the Fourth Proportional to 6,612.75, 9,122.42 and 3,959.64

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Solution

The fourth proportional to 6,612.75, 9,122.42 and 3,959.64 is: 5,462.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,612.75 : 9,122.42 = 3,959.64 : x
  2. Step 2: Convert to fraction form
    6,612.75/9,122.42 = 3,959.64/x
  3. Step 3: Cross multiply
    6,612.75x = 9,122.42 × 3,959.64
  4. Step 4: Simplify right side
    6,612.75x = 36,121,479.33
  5. Step 5: Solve for x
    x = 36,121,479.33/6,612.75
  6. Step 6: Final answer
    x = 5,462.40

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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.