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Finding the Fourth Proportional to 619.46, 929.20 and 331.46

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Solution

The fourth proportional to 619.46, 929.20 and 331.46 is: 497.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.46 : 929.20 = 331.46 : x
  2. Step 2: Convert to fraction form
    619.46/929.20 = 331.46/x
  3. Step 3: Cross multiply
    619.46x = 929.20 × 331.46
  4. Step 4: Simplify right side
    619.46x = 307,992.63
  5. Step 5: Solve for x
    x = 307,992.63/619.46
  6. Step 6: Final answer
    x = 497.20

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Double scale
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Similar ratio
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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.