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Finding the Fourth Proportional to 1,331.99, 1,999.76 and 1,138.23

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Solution

The fourth proportional to 1,331.99, 1,999.76 and 1,138.23 is: 1,708.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.99 : 1,999.76 = 1,138.23 : x
  2. Step 2: Convert to fraction form
    1,331.99/1,999.76 = 1,138.23/x
  3. Step 3: Cross multiply
    1,331.99x = 1,999.76 × 1,138.23
  4. Step 4: Simplify right side
    1,331.99x = 2,276,188.63
  5. Step 5: Solve for x
    x = 2,276,188.63/1,331.99
  6. Step 6: Final answer
    x = 1,708.86

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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.