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Finding the Fourth Proportional to 942.42, 1,299.96 and 627.66

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Solution

The fourth proportional to 942.42, 1,299.96 and 627.66 is: 865.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.42 : 1,299.96 = 627.66 : x
  2. Step 2: Convert to fraction form
    942.42/1,299.96 = 627.66/x
  3. Step 3: Cross multiply
    942.42x = 1,299.96 × 627.66
  4. Step 4: Simplify right side
    942.42x = 815,932.89
  5. Step 5: Solve for x
    x = 815,932.89/942.42
  6. Step 6: Final answer
    x = 865.78

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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.