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Finding the Fourth Proportional to 994.14, 1,371.66 and 621.30

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Solution

The fourth proportional to 994.14, 1,371.66 and 621.30 is: 857.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.14 : 1,371.66 = 621.30 : x
  2. Step 2: Convert to fraction form
    994.14/1,371.66 = 621.30/x
  3. Step 3: Cross multiply
    994.14x = 1,371.66 × 621.30
  4. Step 4: Simplify right side
    994.14x = 852,212.36
  5. Step 5: Solve for x
    x = 852,212.36/994.14
  6. Step 6: Final answer
    x = 857.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.