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Finding the Fourth Proportional to 619.08, 928.78 and 208.22

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Solution

The fourth proportional to 619.08, 928.78 and 208.22 is: 312.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.08 : 928.78 = 208.22 : x
  2. Step 2: Convert to fraction form
    619.08/928.78 = 208.22/x
  3. Step 3: Cross multiply
    619.08x = 928.78 × 208.22
  4. Step 4: Simplify right side
    619.08x = 193,390.57
  5. Step 5: Solve for x
    x = 193,390.57/619.08
  6. Step 6: Final answer
    x = 312.38

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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.