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Finding the Fourth Proportional to 1,379.22, 1,903.54 and 1,086.70

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Solution

The fourth proportional to 1,379.22, 1,903.54 and 1,086.70 is: 1,499.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.22 : 1,903.54 = 1,086.70 : x
  2. Step 2: Convert to fraction form
    1,379.22/1,903.54 = 1,086.70/x
  3. Step 3: Cross multiply
    1,379.22x = 1,903.54 × 1,086.70
  4. Step 4: Simplify right side
    1,379.22x = 2,068,576.92
  5. Step 5: Solve for x
    x = 2,068,576.92/1,379.22
  6. Step 6: Final answer
    x = 1,499.82

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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.