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Finding the Fourth Proportional to 995.94, 1,371.44 and 715.68

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Solution

The fourth proportional to 995.94, 1,371.44 and 715.68 is: 985.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.94 : 1,371.44 = 715.68 : x
  2. Step 2: Convert to fraction form
    995.94/1,371.44 = 715.68/x
  3. Step 3: Cross multiply
    995.94x = 1,371.44 × 715.68
  4. Step 4: Simplify right side
    995.94x = 981,512.18
  5. Step 5: Solve for x
    x = 981,512.18/995.94
  6. Step 6: Final answer
    x = 985.51

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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.