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Finding the Fourth Proportional to 3,930, 5,895 and 1,621.56

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Solution

The fourth proportional to 3,930, 5,895 and 1,621.56 is: 2,432.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930 : 5,895 = 1,621.56 : x
  2. Step 2: Convert to fraction form
    3,930/5,895 = 1,621.56/x
  3. Step 3: Cross multiply
    3,930x = 5,895 × 1,621.56
  4. Step 4: Simplify right side
    3,930x = 9,559,096.20
  5. Step 5: Solve for x
    x = 9,559,096.20/3,930
  6. Step 6: Final answer
    x = 2,432.34

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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.