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Finding the Fourth Proportional to 1,283.75, 1,771.58 and 818.27

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Solution

The fourth proportional to 1,283.75, 1,771.58 and 818.27 is: 1,129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.75 : 1,771.58 = 818.27 : x
  2. Step 2: Convert to fraction form
    1,283.75/1,771.58 = 818.27/x
  3. Step 3: Cross multiply
    1,283.75x = 1,771.58 × 818.27
  4. Step 4: Simplify right side
    1,283.75x = 1,449,626.68
  5. Step 5: Solve for x
    x = 1,449,626.68/1,283.75
  6. Step 6: Final answer
    x = 1,129.21

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1.5x scale

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.