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Finding the Fourth Proportional to 505.54, 697.64 and 306.38

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Solution

The fourth proportional to 505.54, 697.64 and 306.38 is: 422.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.54 : 697.64 = 306.38 : x
  2. Step 2: Convert to fraction form
    505.54/697.64 = 306.38/x
  3. Step 3: Cross multiply
    505.54x = 697.64 × 306.38
  4. Step 4: Simplify right side
    505.54x = 213,742.94
  5. Step 5: Solve for x
    x = 213,742.94/505.54
  6. Step 6: Final answer
    x = 422.80

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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.