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Finding the Fourth Proportional to 2,666.78, 3,999.40 and 817.49

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Solution

The fourth proportional to 2,666.78, 3,999.40 and 817.49 is: 1,225.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,666.78 : 3,999.40 = 817.49 : x
  2. Step 2: Convert to fraction form
    2,666.78/3,999.40 = 817.49/x
  3. Step 3: Cross multiply
    2,666.78x = 3,999.40 × 817.49
  4. Step 4: Simplify right side
    2,666.78x = 3,269,447.47
  5. Step 5: Solve for x
    x = 3,269,447.47/2,666.78
  6. Step 6: Final answer
    x = 1,225.99

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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.