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Finding the Fourth Proportional to 1,388.92, 2,092.75 and 1,239.75

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Solution

The fourth proportional to 1,388.92, 2,092.75 and 1,239.75 is: 1,867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.92 : 2,092.75 = 1,239.75 : x
  2. Step 2: Convert to fraction form
    1,388.92/2,092.75 = 1,239.75/x
  3. Step 3: Cross multiply
    1,388.92x = 2,092.75 × 1,239.75
  4. Step 4: Simplify right side
    1,388.92x = 2,594,486.81
  5. Step 5: Solve for x
    x = 2,594,486.81/1,388.92
  6. Step 6: Final answer
    x = 1,867.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.