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Finding the Fourth Proportional to 994.65, 1,491.99 and 378.64

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Solution

The fourth proportional to 994.65, 1,491.99 and 378.64 is: 567.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.65 : 1,491.99 = 378.64 : x
  2. Step 2: Convert to fraction form
    994.65/1,491.99 = 378.64/x
  3. Step 3: Cross multiply
    994.65x = 1,491.99 × 378.64
  4. Step 4: Simplify right side
    994.65x = 564,927.09
  5. Step 5: Solve for x
    x = 564,927.09/994.65
  6. Step 6: Final answer
    x = 567.97

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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.