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Finding the Fourth Proportional to 520.47, 780.71 and 329.31

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Solution

The fourth proportional to 520.47, 780.71 and 329.31 is: 493.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.47 : 780.71 = 329.31 : x
  2. Step 2: Convert to fraction form
    520.47/780.71 = 329.31/x
  3. Step 3: Cross multiply
    520.47x = 780.71 × 329.31
  4. Step 4: Simplify right side
    520.47x = 257,093.96
  5. Step 5: Solve for x
    x = 257,093.96/520.47
  6. Step 6: Final answer
    x = 493.97

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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.