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Finding the Fourth Proportional to 1,388.70, 2,083.05 and 1,267.20

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Solution

The fourth proportional to 1,388.70, 2,083.05 and 1,267.20 is: 1,900.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.70 : 2,083.05 = 1,267.20 : x
  2. Step 2: Convert to fraction form
    1,388.70/2,083.05 = 1,267.20/x
  3. Step 3: Cross multiply
    1,388.70x = 2,083.05 × 1,267.20
  4. Step 4: Simplify right side
    1,388.70x = 2,639,640.96
  5. Step 5: Solve for x
    x = 2,639,640.96/1,388.70
  6. Step 6: Final answer
    x = 1,900.80

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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.