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Finding the Fourth Proportional to 1,209.73, 1,668.95 and 789.95

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Solution

The fourth proportional to 1,209.73, 1,668.95 and 789.95 is: 1,089.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.73 : 1,668.95 = 789.95 : x
  2. Step 2: Convert to fraction form
    1,209.73/1,668.95 = 789.95/x
  3. Step 3: Cross multiply
    1,209.73x = 1,668.95 × 789.95
  4. Step 4: Simplify right side
    1,209.73x = 1,318,374.76
  5. Step 5: Solve for x
    x = 1,318,374.76/1,209.73
  6. Step 6: Final answer
    x = 1,089.81

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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.