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Finding the Fourth Proportional to 7,420.78, 11,131.17 and 3,040.30

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Solution

The fourth proportional to 7,420.78, 11,131.17 and 3,040.30 is: 4,560.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,420.78 : 11,131.17 = 3,040.30 : x
  2. Step 2: Convert to fraction form
    7,420.78/11,131.17 = 3,040.30/x
  3. Step 3: Cross multiply
    7,420.78x = 11,131.17 × 3,040.30
  4. Step 4: Simplify right side
    7,420.78x = 33,842,096.15
  5. Step 5: Solve for x
    x = 33,842,096.15/7,420.78
  6. Step 6: Final answer
    x = 4,560.45

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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.