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Finding the Fourth Proportional to 994.41, 1,372.08 and 640.19

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Solution

The fourth proportional to 994.41, 1,372.08 and 640.19 is: 883.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.41 : 1,372.08 = 640.19 : x
  2. Step 2: Convert to fraction form
    994.41/1,372.08 = 640.19/x
  3. Step 3: Cross multiply
    994.41x = 1,372.08 × 640.19
  4. Step 4: Simplify right side
    994.41x = 878,385.03
  5. Step 5: Solve for x
    x = 878,385.03/994.41
  6. Step 6: Final answer
    x = 883.32

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1.5x scale

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.