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Finding the Fourth Proportional to 817.35, 1,225.59 and 269.20

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Solution

The fourth proportional to 817.35, 1,225.59 and 269.20 is: 403.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.35 : 1,225.59 = 269.20 : x
  2. Step 2: Convert to fraction form
    817.35/1,225.59 = 269.20/x
  3. Step 3: Cross multiply
    817.35x = 1,225.59 × 269.20
  4. Step 4: Simplify right side
    817.35x = 329,928.83
  5. Step 5: Solve for x
    x = 329,928.83/817.35
  6. Step 6: Final answer
    x = 403.66

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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.