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Finding the Third Proportional to 642.38 and 858.94

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Solution

The third proportional to 642.38 and 858.94 is: 1,148.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.38 : 858.94 = 858.94 : x
  2. Step 2: Convert to fraction form
    642.38/858.94 = 858.94/x
  3. Step 3: Cross multiply
    642.38x = 858.94 × 858.94
  4. Step 4: Simplify right side
    642.38x = 737,773.63
  5. Step 5: Solve for x
    x = 737,773.63/642.38
  6. Step 6: Final answer
    x = 1,148.51

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.