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Finding the Fourth Proportional to 717.99, 990.60 and 423.36

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Solution

The fourth proportional to 717.99, 990.60 and 423.36 is: 584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.99 : 990.60 = 423.36 : x
  2. Step 2: Convert to fraction form
    717.99/990.60 = 423.36/x
  3. Step 3: Cross multiply
    717.99x = 990.60 × 423.36
  4. Step 4: Simplify right side
    717.99x = 419,380.42
  5. Step 5: Solve for x
    x = 419,380.42/717.99
  6. Step 6: Final answer
    x = 584.10

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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.