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Finding the Fourth Proportional to 619.71, 929.57 and 331.71

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Solution

The fourth proportional to 619.71, 929.57 and 331.71 is: 497.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.71 : 929.57 = 331.71 : x
  2. Step 2: Convert to fraction form
    619.71/929.57 = 331.71/x
  3. Step 3: Cross multiply
    619.71x = 929.57 × 331.71
  4. Step 4: Simplify right side
    619.71x = 308,346.01
  5. Step 5: Solve for x
    x = 308,346.01/619.71
  6. Step 6: Final answer
    x = 497.57

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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.