Home / 12,211.20-18,316.80-7,278.30

Finding the Fourth Proportional to 12,211.20, 18,316.80 and 7,278.30

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Solution

The fourth proportional to 12,211.20, 18,316.80 and 7,278.30 is: 10,917.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,211.20 : 18,316.80 = 7,278.30 : x
  2. Step 2: Convert to fraction form
    12,211.20/18,316.80 = 7,278.30/x
  3. Step 3: Cross multiply
    12,211.20x = 18,316.80 × 7,278.30
  4. Step 4: Simplify right side
    12,211.20x = 133,315,165.44
  5. Step 5: Solve for x
    x = 133,315,165.44/12,211.20
  6. Step 6: Final answer
    x = 10,917.45

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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.