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Finding the Fourth Proportional to 817.35, 1,225.61 and 269.18

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Solution

The fourth proportional to 817.35, 1,225.61 and 269.18 is: 403.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.35 : 1,225.61 = 269.18 : x
  2. Step 2: Convert to fraction form
    817.35/1,225.61 = 269.18/x
  3. Step 3: Cross multiply
    817.35x = 1,225.61 × 269.18
  4. Step 4: Simplify right side
    817.35x = 329,909.70
  5. Step 5: Solve for x
    x = 329,909.70/817.35
  6. Step 6: Final answer
    x = 403.63

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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.