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Finding the Fourth Proportional to 995.09, 1,373.49 and 621.86

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Solution

The fourth proportional to 995.09, 1,373.49 and 621.86 is: 858.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.09 : 1,373.49 = 621.86 : x
  2. Step 2: Convert to fraction form
    995.09/1,373.49 = 621.86/x
  3. Step 3: Cross multiply
    995.09x = 1,373.49 × 621.86
  4. Step 4: Simplify right side
    995.09x = 854,121.93
  5. Step 5: Solve for x
    x = 854,121.93/995.09
  6. Step 6: Final answer
    x = 858.33

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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.