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Finding the Fourth Proportional to 995.60, 1,372.68 and 640.91

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Solution

The fourth proportional to 995.60, 1,372.68 and 640.91 is: 883.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.60 : 1,372.68 = 640.91 : x
  2. Step 2: Convert to fraction form
    995.60/1,372.68 = 640.91/x
  3. Step 3: Cross multiply
    995.60x = 1,372.68 × 640.91
  4. Step 4: Simplify right side
    995.60x = 879,757.48
  5. Step 5: Solve for x
    x = 879,757.48/995.60
  6. Step 6: Final answer
    x = 883.65

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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.