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Finding the Fourth Proportional to 521.87, 720.06 and 325.31

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Solution

The fourth proportional to 521.87, 720.06 and 325.31 is: 448.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.87 : 720.06 = 325.31 : x
  2. Step 2: Convert to fraction form
    521.87/720.06 = 325.31/x
  3. Step 3: Cross multiply
    521.87x = 720.06 × 325.31
  4. Step 4: Simplify right side
    521.87x = 234,242.72
  5. Step 5: Solve for x
    x = 234,242.72/521.87
  6. Step 6: Final answer
    x = 448.85

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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.