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Finding the Fourth Proportional to 915.41, 1,252.36 and 911.49

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Solution

The fourth proportional to 915.41, 1,252.36 and 911.49 is: 1,247.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.41 : 1,252.36 = 911.49 : x
  2. Step 2: Convert to fraction form
    915.41/1,252.36 = 911.49/x
  3. Step 3: Cross multiply
    915.41x = 1,252.36 × 911.49
  4. Step 4: Simplify right side
    915.41x = 1,141,513.62
  5. Step 5: Solve for x
    x = 1,141,513.62/915.41
  6. Step 6: Final answer
    x = 1,247.00

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.