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Finding the Fourth Proportional to 1,221.73, 1,685.69 and 690.62

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Solution

The fourth proportional to 1,221.73, 1,685.69 and 690.62 is: 952.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.73 : 1,685.69 = 690.62 : x
  2. Step 2: Convert to fraction form
    1,221.73/1,685.69 = 690.62/x
  3. Step 3: Cross multiply
    1,221.73x = 1,685.69 × 690.62
  4. Step 4: Simplify right side
    1,221.73x = 1,164,171.23
  5. Step 5: Solve for x
    x = 1,164,171.23/1,221.73
  6. Step 6: Final answer
    x = 952.89

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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.