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Finding the Fourth Proportional to 717.08, 989.55 and 422.33

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Solution

The fourth proportional to 717.08, 989.55 and 422.33 is: 582.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.08 : 989.55 = 422.33 : x
  2. Step 2: Convert to fraction form
    717.08/989.55 = 422.33/x
  3. Step 3: Cross multiply
    717.08x = 989.55 × 422.33
  4. Step 4: Simplify right side
    717.08x = 417,916.65
  5. Step 5: Solve for x
    x = 417,916.65/717.08
  6. Step 6: Final answer
    x = 582.80

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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.