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Finding the Fourth Proportional to 1,165.87, 1,608.92 and 641.89

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Solution

The fourth proportional to 1,165.87, 1,608.92 and 641.89 is: 885.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.87 : 1,608.92 = 641.89 : x
  2. Step 2: Convert to fraction form
    1,165.87/1,608.92 = 641.89/x
  3. Step 3: Cross multiply
    1,165.87x = 1,608.92 × 641.89
  4. Step 4: Simplify right side
    1,165.87x = 1,032,738.40
  5. Step 5: Solve for x
    x = 1,032,738.40/1,165.87
  6. Step 6: Final answer
    x = 885.81

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1.5x scale

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.