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Finding the Fourth Proportional to 995.37, 1,372.87 and 641.06

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Solution

The fourth proportional to 995.37, 1,372.87 and 641.06 is: 884.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.37 : 1,372.87 = 641.06 : x
  2. Step 2: Convert to fraction form
    995.37/1,372.87 = 641.06/x
  3. Step 3: Cross multiply
    995.37x = 1,372.87 × 641.06
  4. Step 4: Simplify right side
    995.37x = 880,088.84
  5. Step 5: Solve for x
    x = 880,088.84/995.37
  6. Step 6: Final answer
    x = 884.19

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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.