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Finding the Fourth Proportional to 2,665.76, 3,999.92 and 2,020.40

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Solution

The fourth proportional to 2,665.76, 3,999.92 and 2,020.40 is: 3,031.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,665.76 : 3,999.92 = 2,020.40 : x
  2. Step 2: Convert to fraction form
    2,665.76/3,999.92 = 2,020.40/x
  3. Step 3: Cross multiply
    2,665.76x = 3,999.92 × 2,020.40
  4. Step 4: Simplify right side
    2,665.76x = 8,081,438.37
  5. Step 5: Solve for x
    x = 8,081,438.37/2,665.76
  6. Step 6: Final answer
    x = 3,031.57

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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.