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Finding the Fourth Proportional to 5,241.78, 7,230.92 and 3,980.76

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Solution

The fourth proportional to 5,241.78, 7,230.92 and 3,980.76 is: 5,491.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,241.78 : 7,230.92 = 3,980.76 : x
  2. Step 2: Convert to fraction form
    5,241.78/7,230.92 = 3,980.76/x
  3. Step 3: Cross multiply
    5,241.78x = 7,230.92 × 3,980.76
  4. Step 4: Simplify right side
    5,241.78x = 28,784,557.10
  5. Step 5: Solve for x
    x = 28,784,557.10/5,241.78
  6. Step 6: Final answer
    x = 5,491.37

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.