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Finding the Fourth Proportional to 994.19, 1,371.71 and 621.55

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Solution

The fourth proportional to 994.19, 1,371.71 and 621.55 is: 857.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.19 : 1,371.71 = 621.55 : x
  2. Step 2: Convert to fraction form
    994.19/1,371.71 = 621.55/x
  3. Step 3: Cross multiply
    994.19x = 1,371.71 × 621.55
  4. Step 4: Simplify right side
    994.19x = 852,583.24
  5. Step 5: Solve for x
    x = 852,583.24/994.19
  6. Step 6: Final answer
    x = 857.57

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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.