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Finding the Fourth Proportional to 995.95, 1,374.57 and 717.11

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Solution

The fourth proportional to 995.95, 1,374.57 and 717.11 is: 989.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.95 : 1,374.57 = 717.11 : x
  2. Step 2: Convert to fraction form
    995.95/1,374.57 = 717.11/x
  3. Step 3: Cross multiply
    995.95x = 1,374.57 × 717.11
  4. Step 4: Simplify right side
    995.95x = 985,717.89
  5. Step 5: Solve for x
    x = 985,717.89/995.95
  6. Step 6: Final answer
    x = 989.73

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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.