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Finding the Fourth Proportional to 995.12, 1,372.52 and 640.81

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Solution

The fourth proportional to 995.12, 1,372.52 and 640.81 is: 883.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.12 : 1,372.52 = 640.81 : x
  2. Step 2: Convert to fraction form
    995.12/1,372.52 = 640.81/x
  3. Step 3: Cross multiply
    995.12x = 1,372.52 × 640.81
  4. Step 4: Simplify right side
    995.12x = 879,522.71
  5. Step 5: Solve for x
    x = 879,522.71/995.12
  6. Step 6: Final answer
    x = 883.84

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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.