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Finding the Fourth Proportional to 531.56, 733.60 and 321.78

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Solution

The fourth proportional to 531.56, 733.60 and 321.78 is: 444.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.56 : 733.60 = 321.78 : x
  2. Step 2: Convert to fraction form
    531.56/733.60 = 321.78/x
  3. Step 3: Cross multiply
    531.56x = 733.60 × 321.78
  4. Step 4: Simplify right side
    531.56x = 236,057.81
  5. Step 5: Solve for x
    x = 236,057.81/531.56
  6. Step 6: Final answer
    x = 444.08

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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.