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Finding the Fourth Proportional to 994.75, 1,489.18 and 685.95

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Solution

The fourth proportional to 994.75, 1,489.18 and 685.95 is: 1,026.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.75 : 1,489.18 = 685.95 : x
  2. Step 2: Convert to fraction form
    994.75/1,489.18 = 685.95/x
  3. Step 3: Cross multiply
    994.75x = 1,489.18 × 685.95
  4. Step 4: Simplify right side
    994.75x = 1,021,503.02
  5. Step 5: Solve for x
    x = 1,021,503.02/994.75
  6. Step 6: Final answer
    x = 1,026.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.