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Finding the Fourth Proportional to 717.06, 989.40 and 422.28

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Solution

The fourth proportional to 717.06, 989.40 and 422.28 is: 582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.06 : 989.40 = 422.28 : x
  2. Step 2: Convert to fraction form
    717.06/989.40 = 422.28/x
  3. Step 3: Cross multiply
    717.06x = 989.40 × 422.28
  4. Step 4: Simplify right side
    717.06x = 417,803.83
  5. Step 5: Solve for x
    x = 417,803.83/717.06
  6. Step 6: Final answer
    x = 582.66

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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.