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Finding the Fourth Proportional to 7,447.40, 11,171.10 and 5,479.10

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Solution

The fourth proportional to 7,447.40, 11,171.10 and 5,479.10 is: 8,218.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,447.40 : 11,171.10 = 5,479.10 : x
  2. Step 2: Convert to fraction form
    7,447.40/11,171.10 = 5,479.10/x
  3. Step 3: Cross multiply
    7,447.40x = 11,171.10 × 5,479.10
  4. Step 4: Simplify right side
    7,447.40x = 61,207,574.01
  5. Step 5: Solve for x
    x = 61,207,574.01/7,447.40
  6. Step 6: Final answer
    x = 8,218.65

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.