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Finding the Fourth Proportional to 995.13, 1,372.56 and 641.16

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Solution

The fourth proportional to 995.13, 1,372.56 and 641.16 is: 884.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.13 : 1,372.56 = 641.16 : x
  2. Step 2: Convert to fraction form
    995.13/1,372.56 = 641.16/x
  3. Step 3: Cross multiply
    995.13x = 1,372.56 × 641.16
  4. Step 4: Simplify right side
    995.13x = 880,030.57
  5. Step 5: Solve for x
    x = 880,030.57/995.13
  6. Step 6: Final answer
    x = 884.34

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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.