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Finding the Fourth Proportional to 521.75, 720.29 and 356.20

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Solution

The fourth proportional to 521.75, 720.29 and 356.20 is: 491.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.75 : 720.29 = 356.20 : x
  2. Step 2: Convert to fraction form
    521.75/720.29 = 356.20/x
  3. Step 3: Cross multiply
    521.75x = 720.29 × 356.20
  4. Step 4: Simplify right side
    521.75x = 256,567.30
  5. Step 5: Solve for x
    x = 256,567.30/521.75
  6. Step 6: Final answer
    x = 491.74

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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.