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Finding the Fourth Proportional to 531.50, 733.90 and 421.56

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Solution

The fourth proportional to 531.50, 733.90 and 421.56 is: 582.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    531.50 : 733.90 = 421.56 : x
  2. Step 2: Convert to fraction form
    531.50/733.90 = 421.56/x
  3. Step 3: Cross multiply
    531.50x = 733.90 × 421.56
  4. Step 4: Simplify right side
    531.50x = 309,382.88
  5. Step 5: Solve for x
    x = 309,382.88/531.50
  6. Step 6: Final answer
    x = 582.09

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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.