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Finding the Fourth Proportional to 619.11, 928.81 and 208.34

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Solution

The fourth proportional to 619.11, 928.81 and 208.34 is: 312.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.11 : 928.81 = 208.34 : x
  2. Step 2: Convert to fraction form
    619.11/928.81 = 208.34/x
  3. Step 3: Cross multiply
    619.11x = 928.81 × 208.34
  4. Step 4: Simplify right side
    619.11x = 193,503.63
  5. Step 5: Solve for x
    x = 193,503.63/619.11
  6. Step 6: Final answer
    x = 312.55

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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.