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Finding the Fourth Proportional to 717.83, 990.79 and 423.19

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Solution

The fourth proportional to 717.83, 990.79 and 423.19 is: 584.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.83 : 990.79 = 423.19 : x
  2. Step 2: Convert to fraction form
    717.83/990.79 = 423.19/x
  3. Step 3: Cross multiply
    717.83x = 990.79 × 423.19
  4. Step 4: Simplify right side
    717.83x = 419,292.60
  5. Step 5: Solve for x
    x = 419,292.60/717.83
  6. Step 6: Final answer
    x = 584.11

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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.