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Finding the Fourth Proportional to 1,388.24, 1,915.84 and 798.86

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Solution

The fourth proportional to 1,388.24, 1,915.84 and 798.86 is: 1,102.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.24 : 1,915.84 = 798.86 : x
  2. Step 2: Convert to fraction form
    1,388.24/1,915.84 = 798.86/x
  3. Step 3: Cross multiply
    1,388.24x = 1,915.84 × 798.86
  4. Step 4: Simplify right side
    1,388.24x = 1,530,474.37
  5. Step 5: Solve for x
    x = 1,530,474.37/1,388.24
  6. Step 6: Final answer
    x = 1,102.46

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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.