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Finding the Fourth Proportional to 1,388.36, 1,912.98 and 1,073.68

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Solution

The fourth proportional to 1,388.36, 1,912.98 and 1,073.68 is: 1,479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.36 : 1,912.98 = 1,073.68 : x
  2. Step 2: Convert to fraction form
    1,388.36/1,912.98 = 1,073.68/x
  3. Step 3: Cross multiply
    1,388.36x = 1,912.98 × 1,073.68
  4. Step 4: Simplify right side
    1,388.36x = 2,053,927.61
  5. Step 5: Solve for x
    x = 2,053,927.61/1,388.36
  6. Step 6: Final answer
    x = 1,479.39

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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.