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Finding the Fourth Proportional to 521.36, 719.22 and 311.41

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Solution

The fourth proportional to 521.36, 719.22 and 311.41 is: 429.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.36 : 719.22 = 311.41 : x
  2. Step 2: Convert to fraction form
    521.36/719.22 = 311.41/x
  3. Step 3: Cross multiply
    521.36x = 719.22 × 311.41
  4. Step 4: Simplify right side
    521.36x = 223,972.30
  5. Step 5: Solve for x
    x = 223,972.30/521.36
  6. Step 6: Final answer
    x = 429.59

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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.