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Finding the Fourth Proportional to 817.07, 1,225.79 and 269.29

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Solution

The fourth proportional to 817.07, 1,225.79 and 269.29 is: 403.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.07 : 1,225.79 = 269.29 : x
  2. Step 2: Convert to fraction form
    817.07/1,225.79 = 269.29/x
  3. Step 3: Cross multiply
    817.07x = 1,225.79 × 269.29
  4. Step 4: Simplify right side
    817.07x = 330,085.51
  5. Step 5: Solve for x
    x = 330,085.51/817.07
  6. Step 6: Final answer
    x = 403.99

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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.