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Finding the Fourth Proportional to 994.78, 1,491.90 and 378.37

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Solution

The fourth proportional to 994.78, 1,491.90 and 378.37 is: 567.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.78 : 1,491.90 = 378.37 : x
  2. Step 2: Convert to fraction form
    994.78/1,491.90 = 378.37/x
  3. Step 3: Cross multiply
    994.78x = 1,491.90 × 378.37
  4. Step 4: Simplify right side
    994.78x = 564,490.20
  5. Step 5: Solve for x
    x = 564,490.20/994.78
  6. Step 6: Final answer
    x = 567.45

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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.