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Finding the Fourth Proportional to 2,620.76, 3,931.13 and 1,321.31

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Solution

The fourth proportional to 2,620.76, 3,931.13 and 1,321.31 is: 1,981.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.76 : 3,931.13 = 1,321.31 : x
  2. Step 2: Convert to fraction form
    2,620.76/3,931.13 = 1,321.31/x
  3. Step 3: Cross multiply
    2,620.76x = 3,931.13 × 1,321.31
  4. Step 4: Simplify right side
    2,620.76x = 5,194,254.51
  5. Step 5: Solve for x
    x = 5,194,254.51/2,620.76
  6. Step 6: Final answer
    x = 1,981.97

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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.