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Finding the Fourth Proportional to 812.47, 1,218.47 and 579.42

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Solution

The fourth proportional to 812.47, 1,218.47 and 579.42 is: 868.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.47 : 1,218.47 = 579.42 : x
  2. Step 2: Convert to fraction form
    812.47/1,218.47 = 579.42/x
  3. Step 3: Cross multiply
    812.47x = 1,218.47 × 579.42
  4. Step 4: Simplify right side
    812.47x = 706,005.89
  5. Step 5: Solve for x
    x = 706,005.89/812.47
  6. Step 6: Final answer
    x = 868.96

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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.