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Finding the Fourth Proportional to 2,666.25, 3,999.96 and 817.50

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Solution

The fourth proportional to 2,666.25, 3,999.96 and 817.50 is: 1,226.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.25 : 3,999.96 = 817.50 : x
  2. Step 2: Convert to fraction form
    2,666.25/3,999.96 = 817.50/x
  3. Step 3: Cross multiply
    2,666.25x = 3,999.96 × 817.50
  4. Step 4: Simplify right side
    2,666.25x = 3,269,967.30
  5. Step 5: Solve for x
    x = 3,269,967.30/2,666.25
  6. Step 6: Final answer
    x = 1,226.43

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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.