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Finding the Fourth Proportional to 911.32, 1,257.06 and 649.42

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Solution

The fourth proportional to 911.32, 1,257.06 and 649.42 is: 895.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.32 : 1,257.06 = 649.42 : x
  2. Step 2: Convert to fraction form
    911.32/1,257.06 = 649.42/x
  3. Step 3: Cross multiply
    911.32x = 1,257.06 × 649.42
  4. Step 4: Simplify right side
    911.32x = 816,359.91
  5. Step 5: Solve for x
    x = 816,359.91/911.32
  6. Step 6: Final answer
    x = 895.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.