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Finding the Fourth Proportional to 815.94, 1,223.91 and 469.80

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Solution

The fourth proportional to 815.94, 1,223.91 and 469.80 is: 704.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.94 : 1,223.91 = 469.80 : x
  2. Step 2: Convert to fraction form
    815.94/1,223.91 = 469.80/x
  3. Step 3: Cross multiply
    815.94x = 1,223.91 × 469.80
  4. Step 4: Simplify right side
    815.94x = 574,992.92
  5. Step 5: Solve for x
    x = 574,992.92/815.94
  6. Step 6: Final answer
    x = 704.70

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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.