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Finding the Fourth Proportional to 1,311.49, 1,967.70 and 661.73

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Solution

The fourth proportional to 1,311.49, 1,967.70 and 661.73 is: 992.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.49 : 1,967.70 = 661.73 : x
  2. Step 2: Convert to fraction form
    1,311.49/1,967.70 = 661.73/x
  3. Step 3: Cross multiply
    1,311.49x = 1,967.70 × 661.73
  4. Step 4: Simplify right side
    1,311.49x = 1,302,086.12
  5. Step 5: Solve for x
    x = 1,302,086.12/1,311.49
  6. Step 6: Final answer
    x = 992.83

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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.