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Finding the Fourth Proportional to 994.87, 1,491.94 and 378.26

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Solution

The fourth proportional to 994.87, 1,491.94 and 378.26 is: 567.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.87 : 1,491.94 = 378.26 : x
  2. Step 2: Convert to fraction form
    994.87/1,491.94 = 378.26/x
  3. Step 3: Cross multiply
    994.87x = 1,491.94 × 378.26
  4. Step 4: Simplify right side
    994.87x = 564,341.22
  5. Step 5: Solve for x
    x = 564,341.22/994.87
  6. Step 6: Final answer
    x = 567.25

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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.