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Finding the Fourth Proportional to 619.50, 929.34 and 208.74

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Solution

The fourth proportional to 619.50, 929.34 and 208.74 is: 313.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.50 : 929.34 = 208.74 : x
  2. Step 2: Convert to fraction form
    619.50/929.34 = 208.74/x
  3. Step 3: Cross multiply
    619.50x = 929.34 × 208.74
  4. Step 4: Simplify right side
    619.50x = 193,990.43
  5. Step 5: Solve for x
    x = 193,990.43/619.50
  6. Step 6: Final answer
    x = 313.14

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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.