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Finding the Fourth Proportional to 619.12, 928.72 and 208.28

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Solution

The fourth proportional to 619.12, 928.72 and 208.28 is: 312.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.12 : 928.72 = 208.28 : x
  2. Step 2: Convert to fraction form
    619.12/928.72 = 208.28/x
  3. Step 3: Cross multiply
    619.12x = 928.72 × 208.28
  4. Step 4: Simplify right side
    619.12x = 193,433.80
  5. Step 5: Solve for x
    x = 193,433.80/619.12
  6. Step 6: Final answer
    x = 312.43

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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.