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Finding the Fourth Proportional to 998.72, 1,380 and 767.84

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Solution

The fourth proportional to 998.72, 1,380 and 767.84 is: 1,060.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.72 : 1,380 = 767.84 : x
  2. Step 2: Convert to fraction form
    998.72/1,380 = 767.84/x
  3. Step 3: Cross multiply
    998.72x = 1,380 × 767.84
  4. Step 4: Simplify right side
    998.72x = 1,059,619.20
  5. Step 5: Solve for x
    x = 1,059,619.20/998.72
  6. Step 6: Final answer
    x = 1,060.98

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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.