Home / 1,638.29-2,260.89-939.67

Finding the Fourth Proportional to 1,638.29, 2,260.89 and 939.67

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Solution

The fourth proportional to 1,638.29, 2,260.89 and 939.67 is: 1,296.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.29 : 2,260.89 = 939.67 : x
  2. Step 2: Convert to fraction form
    1,638.29/2,260.89 = 939.67/x
  3. Step 3: Cross multiply
    1,638.29x = 2,260.89 × 939.67
  4. Step 4: Simplify right side
    1,638.29x = 2,124,484.85
  5. Step 5: Solve for x
    x = 2,124,484.85/1,638.29
  6. Step 6: Final answer
    x = 1,296.77

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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.