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Finding the Fourth Proportional to 531.21, 733.20 and 310.20

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Solution

The fourth proportional to 531.21, 733.20 and 310.20 is: 428.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.21 : 733.20 = 310.20 : x
  2. Step 2: Convert to fraction form
    531.21/733.20 = 310.20/x
  3. Step 3: Cross multiply
    531.21x = 733.20 × 310.20
  4. Step 4: Simplify right side
    531.21x = 227,438.64
  5. Step 5: Solve for x
    x = 227,438.64/531.21
  6. Step 6: Final answer
    x = 428.15

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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.