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Finding the Fourth Proportional to 994.18, 1,371.90 and 552.05

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Solution

The fourth proportional to 994.18, 1,371.90 and 552.05 is: 761.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.18 : 1,371.90 = 552.05 : x
  2. Step 2: Convert to fraction form
    994.18/1,371.90 = 552.05/x
  3. Step 3: Cross multiply
    994.18x = 1,371.90 × 552.05
  4. Step 4: Simplify right side
    994.18x = 757,357.40
  5. Step 5: Solve for x
    x = 757,357.40/994.18
  6. Step 6: Final answer
    x = 761.79

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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.