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Finding the Fourth Proportional to 915.06, 1,371.78 and 338.07

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Solution

The fourth proportional to 915.06, 1,371.78 and 338.07 is: 506.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.06 : 1,371.78 = 338.07 : x
  2. Step 2: Convert to fraction form
    915.06/1,371.78 = 338.07/x
  3. Step 3: Cross multiply
    915.06x = 1,371.78 × 338.07
  4. Step 4: Simplify right side
    915.06x = 463,757.66
  5. Step 5: Solve for x
    x = 463,757.66/915.06
  6. Step 6: Final answer
    x = 506.81

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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.