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Finding the Fourth Proportional to 998.02, 1,375.13 and 717.35

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Solution

The fourth proportional to 998.02, 1,375.13 and 717.35 is: 988.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.02 : 1,375.13 = 717.35 : x
  2. Step 2: Convert to fraction form
    998.02/1,375.13 = 717.35/x
  3. Step 3: Cross multiply
    998.02x = 1,375.13 × 717.35
  4. Step 4: Simplify right side
    998.02x = 986,449.51
  5. Step 5: Solve for x
    x = 986,449.51/998.02
  6. Step 6: Final answer
    x = 988.41

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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.