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Finding the Fourth Proportional to 812.42, 1,218.75 and 235.22

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Solution

The fourth proportional to 812.42, 1,218.75 and 235.22 is: 352.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.42 : 1,218.75 = 235.22 : x
  2. Step 2: Convert to fraction form
    812.42/1,218.75 = 235.22/x
  3. Step 3: Cross multiply
    812.42x = 1,218.75 × 235.22
  4. Step 4: Simplify right side
    812.42x = 286,674.38
  5. Step 5: Solve for x
    x = 286,674.38/812.42
  6. Step 6: Final answer
    x = 352.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.