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Finding the Fourth Proportional to 995.74, 1,374.09 and 553.61

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Solution

The fourth proportional to 995.74, 1,374.09 and 553.61 is: 763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.74 : 1,374.09 = 553.61 : x
  2. Step 2: Convert to fraction form
    995.74/1,374.09 = 553.61/x
  3. Step 3: Cross multiply
    995.74x = 1,374.09 × 553.61
  4. Step 4: Simplify right side
    995.74x = 760,709.96
  5. Step 5: Solve for x
    x = 760,709.96/995.74
  6. Step 6: Final answer
    x = 763.96

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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.