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Finding the Fourth Proportional to 1,165.67, 1,608.60 and 641.70

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Solution

The fourth proportional to 1,165.67, 1,608.60 and 641.70 is: 885.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.67 : 1,608.60 = 641.70 : x
  2. Step 2: Convert to fraction form
    1,165.67/1,608.60 = 641.70/x
  3. Step 3: Cross multiply
    1,165.67x = 1,608.60 × 641.70
  4. Step 4: Simplify right side
    1,165.67x = 1,032,241.03
  5. Step 5: Solve for x
    x = 1,032,241.03/1,165.67
  6. Step 6: Final answer
    x = 885.54

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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.