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Finding the Fourth Proportional to 719.61, 991.94 and 579.48

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Solution

The fourth proportional to 719.61, 991.94 and 579.48 is: 798.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.61 : 991.94 = 579.48 : x
  2. Step 2: Convert to fraction form
    719.61/991.94 = 579.48/x
  3. Step 3: Cross multiply
    719.61x = 991.94 × 579.48
  4. Step 4: Simplify right side
    719.61x = 574,806.49
  5. Step 5: Solve for x
    x = 574,806.49/719.61
  6. Step 6: Final answer
    x = 798.78

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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.