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Finding the Fourth Proportional to 7,880.60, 11,820.90 and 3,720.72

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Solution

The fourth proportional to 7,880.60, 11,820.90 and 3,720.72 is: 5,581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,880.60 : 11,820.90 = 3,720.72 : x
  2. Step 2: Convert to fraction form
    7,880.60/11,820.90 = 3,720.72/x
  3. Step 3: Cross multiply
    7,880.60x = 11,820.90 × 3,720.72
  4. Step 4: Simplify right side
    7,880.60x = 43,982,259.05
  5. Step 5: Solve for x
    x = 43,982,259.05/7,880.60
  6. Step 6: Final answer
    x = 5,581.08

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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.