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Finding the Fourth Proportional to 998.08, 1,376.88 and 648.64

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Solution

The fourth proportional to 998.08, 1,376.88 and 648.64 is: 894.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.08 : 1,376.88 = 648.64 : x
  2. Step 2: Convert to fraction form
    998.08/1,376.88 = 648.64/x
  3. Step 3: Cross multiply
    998.08x = 1,376.88 × 648.64
  4. Step 4: Simplify right side
    998.08x = 893,099.44
  5. Step 5: Solve for x
    x = 893,099.44/998.08
  6. Step 6: Final answer
    x = 894.82

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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.