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Finding the Fourth Proportional to 521.21, 719.45 and 300.25

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Solution

The fourth proportional to 521.21, 719.45 and 300.25 is: 414.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.21 : 719.45 = 300.25 : x
  2. Step 2: Convert to fraction form
    521.21/719.45 = 300.25/x
  3. Step 3: Cross multiply
    521.21x = 719.45 × 300.25
  4. Step 4: Simplify right side
    521.21x = 216,010.14
  5. Step 5: Solve for x
    x = 216,010.14/521.21
  6. Step 6: Final answer
    x = 414.44

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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.