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Finding the Fourth Proportional to 992.33, 1,490.79 and 623.28

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Solution

The fourth proportional to 992.33, 1,490.79 and 623.28 is: 936.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.33 : 1,490.79 = 623.28 : x
  2. Step 2: Convert to fraction form
    992.33/1,490.79 = 623.28/x
  3. Step 3: Cross multiply
    992.33x = 1,490.79 × 623.28
  4. Step 4: Simplify right side
    992.33x = 929,179.59
  5. Step 5: Solve for x
    x = 929,179.59/992.33
  6. Step 6: Final answer
    x = 936.37

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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.