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Finding the Fourth Proportional to 825.90, 1,239.20 and 808.18

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Solution

The fourth proportional to 825.90, 1,239.20 and 808.18 is: 1,212.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.90 : 1,239.20 = 808.18 : x
  2. Step 2: Convert to fraction form
    825.90/1,239.20 = 808.18/x
  3. Step 3: Cross multiply
    825.90x = 1,239.20 × 808.18
  4. Step 4: Simplify right side
    825.90x = 1,001,492.55
  5. Step 5: Solve for x
    x = 1,001,492.55/825.90
  6. Step 6: Final answer
    x = 1,212.61

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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.