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Finding the Fourth Proportional to 1,388.29, 2,081.48 and 521.86

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Solution

The fourth proportional to 1,388.29, 2,081.48 and 521.86 is: 782.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.29 : 2,081.48 = 521.86 : x
  2. Step 2: Convert to fraction form
    1,388.29/2,081.48 = 521.86/x
  3. Step 3: Cross multiply
    1,388.29x = 2,081.48 × 521.86
  4. Step 4: Simplify right side
    1,388.29x = 1,086,240.18
  5. Step 5: Solve for x
    x = 1,086,240.18/1,388.29
  6. Step 6: Final answer
    x = 782.43

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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.