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Finding the Fourth Proportional to 815.99, 1,224.05 and 268.16

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Solution

The fourth proportional to 815.99, 1,224.05 and 268.16 is: 402.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.99 : 1,224.05 = 268.16 : x
  2. Step 2: Convert to fraction form
    815.99/1,224.05 = 268.16/x
  3. Step 3: Cross multiply
    815.99x = 1,224.05 × 268.16
  4. Step 4: Simplify right side
    815.99x = 328,233.79
  5. Step 5: Solve for x
    x = 328,233.79/815.99
  6. Step 6: Final answer
    x = 402.25

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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.