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Finding the Fourth Proportional to 816.99, 1,225.61 and 329.93

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Solution

The fourth proportional to 816.99, 1,225.61 and 329.93 is: 494.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.99 : 1,225.61 = 329.93 : x
  2. Step 2: Convert to fraction form
    816.99/1,225.61 = 329.93/x
  3. Step 3: Cross multiply
    816.99x = 1,225.61 × 329.93
  4. Step 4: Simplify right side
    816.99x = 404,366.92
  5. Step 5: Solve for x
    x = 404,366.92/816.99
  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.