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Finding the Fourth Proportional to 505.50, 697.68 and 331.23

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Solution

The fourth proportional to 505.50, 697.68 and 331.23 is: 457.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.50 : 697.68 = 331.23 : x
  2. Step 2: Convert to fraction form
    505.50/697.68 = 331.23/x
  3. Step 3: Cross multiply
    505.50x = 697.68 × 331.23
  4. Step 4: Simplify right side
    505.50x = 231,092.55
  5. Step 5: Solve for x
    x = 231,092.55/505.50
  6. Step 6: Final answer
    x = 457.16

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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.