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Finding the Fourth Proportional to 619.15, 928.11 and 399.74

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Solution

The fourth proportional to 619.15, 928.11 and 399.74 is: 599.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.15 : 928.11 = 399.74 : x
  2. Step 2: Convert to fraction form
    619.15/928.11 = 399.74/x
  3. Step 3: Cross multiply
    619.15x = 928.11 × 399.74
  4. Step 4: Simplify right side
    619.15x = 371,003.03
  5. Step 5: Solve for x
    x = 371,003.03/619.15
  6. Step 6: Final answer
    x = 599.22

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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.