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Finding the Fourth Proportional to 995.45, 1,373.73 and 553.39

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Solution

The fourth proportional to 995.45, 1,373.73 and 553.39 is: 763.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.45 : 1,373.73 = 553.39 : x
  2. Step 2: Convert to fraction form
    995.45/1,373.73 = 553.39/x
  3. Step 3: Cross multiply
    995.45x = 1,373.73 × 553.39
  4. Step 4: Simplify right side
    995.45x = 760,208.44
  5. Step 5: Solve for x
    x = 760,208.44/995.45
  6. Step 6: Final answer
    x = 763.68

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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.