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Finding the Fourth Proportional to 812.62, 1,218.70 and 292.56

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Solution

The fourth proportional to 812.62, 1,218.70 and 292.56 is: 438.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.62 : 1,218.70 = 292.56 : x
  2. Step 2: Convert to fraction form
    812.62/1,218.70 = 292.56/x
  3. Step 3: Cross multiply
    812.62x = 1,218.70 × 292.56
  4. Step 4: Simplify right side
    812.62x = 356,542.14
  5. Step 5: Solve for x
    x = 356,542.14/812.62
  6. Step 6: Final answer
    x = 438.76

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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.