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Finding the Fourth Proportional to 998.52, 1,378.19 and 648.60

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Solution

The fourth proportional to 998.52, 1,378.19 and 648.60 is: 895.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.52 : 1,378.19 = 648.60 : x
  2. Step 2: Convert to fraction form
    998.52/1,378.19 = 648.60/x
  3. Step 3: Cross multiply
    998.52x = 1,378.19 × 648.60
  4. Step 4: Simplify right side
    998.52x = 893,883.90
  5. Step 5: Solve for x
    x = 893,883.90/998.52
  6. Step 6: Final answer
    x = 895.21

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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.