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Finding the Fourth Proportional to 815.42, 1,223.49 and 404.57

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Solution

The fourth proportional to 815.42, 1,223.49 and 404.57 is: 607.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.42 : 1,223.49 = 404.57 : x
  2. Step 2: Convert to fraction form
    815.42/1,223.49 = 404.57/x
  3. Step 3: Cross multiply
    815.42x = 1,223.49 × 404.57
  4. Step 4: Simplify right side
    815.42x = 494,987.35
  5. Step 5: Solve for x
    x = 494,987.35/815.42
  6. Step 6: Final answer
    x = 607.03

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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.