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Finding the Fourth Proportional to 521.75, 720.31 and 356.21

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Solution

The fourth proportional to 521.75, 720.31 and 356.21 is: 491.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.75 : 720.31 = 356.21 : x
  2. Step 2: Convert to fraction form
    521.75/720.31 = 356.21/x
  3. Step 3: Cross multiply
    521.75x = 720.31 × 356.21
  4. Step 4: Simplify right side
    521.75x = 256,582.54
  5. Step 5: Solve for x
    x = 256,582.54/521.75
  6. Step 6: Final answer
    x = 491.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.