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Finding the Fourth Proportional to 994.53, 1,372.95 and 621.72

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Solution

The fourth proportional to 994.53, 1,372.95 and 621.72 is: 858.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.53 : 1,372.95 = 621.72 : x
  2. Step 2: Convert to fraction form
    994.53/1,372.95 = 621.72/x
  3. Step 3: Cross multiply
    994.53x = 1,372.95 × 621.72
  4. Step 4: Simplify right side
    994.53x = 853,590.47
  5. Step 5: Solve for x
    x = 853,590.47/994.53
  6. Step 6: Final answer
    x = 858.28

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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.