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Finding the Fourth Proportional to 994.36, 1,491.78 and 345.13

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Solution

The fourth proportional to 994.36, 1,491.78 and 345.13 is: 517.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.36 : 1,491.78 = 345.13 : x
  2. Step 2: Convert to fraction form
    994.36/1,491.78 = 345.13/x
  3. Step 3: Cross multiply
    994.36x = 1,491.78 × 345.13
  4. Step 4: Simplify right side
    994.36x = 514,858.03
  5. Step 5: Solve for x
    x = 514,858.03/994.36
  6. Step 6: Final answer
    x = 517.78

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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.