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Finding the Fourth Proportional to 994.38, 1,490.22 and 555

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Solution

The fourth proportional to 994.38, 1,490.22 and 555 is: 831.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.38 : 1,490.22 = 555 : x
  2. Step 2: Convert to fraction form
    994.38/1,490.22 = 555/x
  3. Step 3: Cross multiply
    994.38x = 1,490.22 × 555
  4. Step 4: Simplify right side
    994.38x = 827,072.10
  5. Step 5: Solve for x
    x = 827,072.10/994.38
  6. Step 6: Final answer
    x = 831.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.