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Finding the Fourth Proportional to 2,321.79, 3,480.24 and 761.39

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Solution

The fourth proportional to 2,321.79, 3,480.24 and 761.39 is: 1,141.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,321.79 : 3,480.24 = 761.39 : x
  2. Step 2: Convert to fraction form
    2,321.79/3,480.24 = 761.39/x
  3. Step 3: Cross multiply
    2,321.79x = 3,480.24 × 761.39
  4. Step 4: Simplify right side
    2,321.79x = 2,649,798.73
  5. Step 5: Solve for x
    x = 2,649,798.73/2,321.79
  6. Step 6: Final answer
    x = 1,141.28

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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.