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Finding the Fourth Proportional to 815.92, 1,224 and 238.72

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Solution

The fourth proportional to 815.92, 1,224 and 238.72 is: 358.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.92 : 1,224 = 238.72 : x
  2. Step 2: Convert to fraction form
    815.92/1,224 = 238.72/x
  3. Step 3: Cross multiply
    815.92x = 1,224 × 238.72
  4. Step 4: Simplify right side
    815.92x = 292,193.28
  5. Step 5: Solve for x
    x = 292,193.28/815.92
  6. Step 6: Final answer
    x = 358.12

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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.