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Finding the Fourth Proportional to 816.86, 1,225.44 and 269.06

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Solution

The fourth proportional to 816.86, 1,225.44 and 269.06 is: 403.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.86 : 1,225.44 = 269.06 : x
  2. Step 2: Convert to fraction form
    816.86/1,225.44 = 269.06/x
  3. Step 3: Cross multiply
    816.86x = 1,225.44 × 269.06
  4. Step 4: Simplify right side
    816.86x = 329,716.89
  5. Step 5: Solve for x
    x = 329,716.89/816.86
  6. Step 6: Final answer
    x = 403.64

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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.