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Finding the Fourth Proportional to 3,580.62, 5,370.87 and 1,390.87

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Solution

The fourth proportional to 3,580.62, 5,370.87 and 1,390.87 is: 2,086.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,580.62 : 5,370.87 = 1,390.87 : x
  2. Step 2: Convert to fraction form
    3,580.62/5,370.87 = 1,390.87/x
  3. Step 3: Cross multiply
    3,580.62x = 5,370.87 × 1,390.87
  4. Step 4: Simplify right side
    3,580.62x = 7,470,181.96
  5. Step 5: Solve for x
    x = 7,470,181.96/3,580.62
  6. Step 6: Final answer
    x = 2,086.28

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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.