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Finding the Fourth Proportional to 1,410.92, 2,115.62 and 641

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Solution

The fourth proportional to 1,410.92, 2,115.62 and 641 is: 961.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,410.92 : 2,115.62 = 641 : x
  2. Step 2: Convert to fraction form
    1,410.92/2,115.62 = 641/x
  3. Step 3: Cross multiply
    1,410.92x = 2,115.62 × 641
  4. Step 4: Simplify right side
    1,410.92x = 1,356,112.42
  5. Step 5: Solve for x
    x = 1,356,112.42/1,410.92
  6. Step 6: Final answer
    x = 961.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.