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Finding the Fourth Proportional to 815.63, 1,223.45 and 302.63

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Solution

The fourth proportional to 815.63, 1,223.45 and 302.63 is: 453.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.63 : 1,223.45 = 302.63 : x
  2. Step 2: Convert to fraction form
    815.63/1,223.45 = 302.63/x
  3. Step 3: Cross multiply
    815.63x = 1,223.45 × 302.63
  4. Step 4: Simplify right side
    815.63x = 370,245.04
  5. Step 5: Solve for x
    x = 370,245.04/815.63
  6. Step 6: Final answer
    x = 453.94

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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.