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Finding the Fourth Proportional to 1,283.64, 1,771.19 and 786.41

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Solution

The fourth proportional to 1,283.64, 1,771.19 and 786.41 is: 1,085.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.64 : 1,771.19 = 786.41 : x
  2. Step 2: Convert to fraction form
    1,283.64/1,771.19 = 786.41/x
  3. Step 3: Cross multiply
    1,283.64x = 1,771.19 × 786.41
  4. Step 4: Simplify right side
    1,283.64x = 1,392,868.74
  5. Step 5: Solve for x
    x = 1,392,868.74/1,283.64
  6. Step 6: Final answer
    x = 1,085.09

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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.