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Finding the Fourth Proportional to 994.02, 1,372.37 and 640.07

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Solution

The fourth proportional to 994.02, 1,372.37 and 640.07 is: 883.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.02 : 1,372.37 = 640.07 : x
  2. Step 2: Convert to fraction form
    994.02/1,372.37 = 640.07/x
  3. Step 3: Cross multiply
    994.02x = 1,372.37 × 640.07
  4. Step 4: Simplify right side
    994.02x = 878,412.75
  5. Step 5: Solve for x
    x = 878,412.75/994.02
  6. Step 6: Final answer
    x = 883.70

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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.