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Finding the Fourth Proportional to 12,479.40, 18,719.10 and 3,245.40

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Solution

The fourth proportional to 12,479.40, 18,719.10 and 3,245.40 is: 4,868.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.40 : 18,719.10 = 3,245.40 : x
  2. Step 2: Convert to fraction form
    12,479.40/18,719.10 = 3,245.40/x
  3. Step 3: Cross multiply
    12,479.40x = 18,719.10 × 3,245.40
  4. Step 4: Simplify right side
    12,479.40x = 60,750,967.14
  5. Step 5: Solve for x
    x = 60,750,967.14/12,479.40
  6. Step 6: Final answer
    x = 4,868.10

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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.