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Finding the Fourth Proportional to 998.85, 1,495.18 and 851.23

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Solution

The fourth proportional to 998.85, 1,495.18 and 851.23 is: 1,274.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.85 : 1,495.18 = 851.23 : x
  2. Step 2: Convert to fraction form
    998.85/1,495.18 = 851.23/x
  3. Step 3: Cross multiply
    998.85x = 1,495.18 × 851.23
  4. Step 4: Simplify right side
    998.85x = 1,272,742.07
  5. Step 5: Solve for x
    x = 1,272,742.07/998.85
  6. Step 6: Final answer
    x = 1,274.21

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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.