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Finding the Fourth Proportional to 817.42, 1,225.40 and 330.16

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Solution

The fourth proportional to 817.42, 1,225.40 and 330.16 is: 494.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.42 : 1,225.40 = 330.16 : x
  2. Step 2: Convert to fraction form
    817.42/1,225.40 = 330.16/x
  3. Step 3: Cross multiply
    817.42x = 1,225.40 × 330.16
  4. Step 4: Simplify right side
    817.42x = 404,578.06
  5. Step 5: Solve for x
    x = 404,578.06/817.42
  6. Step 6: Final answer
    x = 494.95

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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.