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Finding the Fourth Proportional to 812.65, 1,218.90 and 292.69

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Solution

The fourth proportional to 812.65, 1,218.90 and 292.69 is: 439.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.65 : 1,218.90 = 292.69 : x
  2. Step 2: Convert to fraction form
    812.65/1,218.90 = 292.69/x
  3. Step 3: Cross multiply
    812.65x = 1,218.90 × 292.69
  4. Step 4: Simplify right side
    812.65x = 356,759.84
  5. Step 5: Solve for x
    x = 356,759.84/812.65
  6. Step 6: Final answer
    x = 439.01

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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.