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Finding the Fourth Proportional to 842.16, 1,255.80 and 834.84

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Solution

The fourth proportional to 842.16, 1,255.80 and 834.84 is: 1,244.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.16 : 1,255.80 = 834.84 : x
  2. Step 2: Convert to fraction form
    842.16/1,255.80 = 834.84/x
  3. Step 3: Cross multiply
    842.16x = 1,255.80 × 834.84
  4. Step 4: Simplify right side
    842.16x = 1,048,392.07
  5. Step 5: Solve for x
    x = 1,048,392.07/842.16
  6. Step 6: Final answer
    x = 1,244.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.