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Finding the Fourth Proportional to 1,381.96, 1,905.23 and 939.09

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Solution

The fourth proportional to 1,381.96, 1,905.23 and 939.09 is: 1,294.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.96 : 1,905.23 = 939.09 : x
  2. Step 2: Convert to fraction form
    1,381.96/1,905.23 = 939.09/x
  3. Step 3: Cross multiply
    1,381.96x = 1,905.23 × 939.09
  4. Step 4: Simplify right side
    1,381.96x = 1,789,182.44
  5. Step 5: Solve for x
    x = 1,789,182.44/1,381.96
  6. Step 6: Final answer
    x = 1,294.67

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1.5x scale

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.