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Finding the Fourth Proportional to 994.31, 1,490.81 and 474.39

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Solution

The fourth proportional to 994.31, 1,490.81 and 474.39 is: 711.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.31 : 1,490.81 = 474.39 : x
  2. Step 2: Convert to fraction form
    994.31/1,490.81 = 474.39/x
  3. Step 3: Cross multiply
    994.31x = 1,490.81 × 474.39
  4. Step 4: Simplify right side
    994.31x = 707,230.35
  5. Step 5: Solve for x
    x = 707,230.35/994.31
  6. Step 6: Final answer
    x = 711.28

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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.