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Finding the Fourth Proportional to 996.55, 1,375.09 and 623.40

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Solution

The fourth proportional to 996.55, 1,375.09 and 623.40 is: 860.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.55 : 1,375.09 = 623.40 : x
  2. Step 2: Convert to fraction form
    996.55/1,375.09 = 623.40/x
  3. Step 3: Cross multiply
    996.55x = 1,375.09 × 623.40
  4. Step 4: Simplify right side
    996.55x = 857,224.39
  5. Step 5: Solve for x
    x = 857,224.39/996.55
  6. Step 6: Final answer
    x = 860.19

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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.