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Finding the Fourth Proportional to 2,666.20, 3,999.30 and 817.07

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Solution

The fourth proportional to 2,666.20, 3,999.30 and 817.07 is: 1,225.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.20 : 3,999.30 = 817.07 : x
  2. Step 2: Convert to fraction form
    2,666.20/3,999.30 = 817.07/x
  3. Step 3: Cross multiply
    2,666.20x = 3,999.30 × 817.07
  4. Step 4: Simplify right side
    2,666.20x = 3,267,709.78
  5. Step 5: Solve for x
    x = 3,267,709.78/2,666.20
  6. Step 6: Final answer
    x = 1,225.61

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1.5x scale

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.