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Finding the Fourth Proportional to 619.45, 929.22 and 208.60

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Solution

The fourth proportional to 619.45, 929.22 and 208.60 is: 312.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.45 : 929.22 = 208.60 : x
  2. Step 2: Convert to fraction form
    619.45/929.22 = 208.60/x
  3. Step 3: Cross multiply
    619.45x = 929.22 × 208.60
  4. Step 4: Simplify right side
    619.45x = 193,835.29
  5. Step 5: Solve for x
    x = 193,835.29/619.45
  6. Step 6: Final answer
    x = 312.92

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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.