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Finding the Fourth Proportional to 994.37, 1,371.49 and 640.06

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Solution

The fourth proportional to 994.37, 1,371.49 and 640.06 is: 882.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.37 : 1,371.49 = 640.06 : x
  2. Step 2: Convert to fraction form
    994.37/1,371.49 = 640.06/x
  3. Step 3: Cross multiply
    994.37x = 1,371.49 × 640.06
  4. Step 4: Simplify right side
    994.37x = 877,830.86
  5. Step 5: Solve for x
    x = 877,830.86/994.37
  6. Step 6: Final answer
    x = 882.81

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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.