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Finding the Fourth Proportional to 1,283.25, 1,770.83 and 811.40

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Solution

The fourth proportional to 1,283.25, 1,770.83 and 811.40 is: 1,119.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.25 : 1,770.83 = 811.40 : x
  2. Step 2: Convert to fraction form
    1,283.25/1,770.83 = 811.40/x
  3. Step 3: Cross multiply
    1,283.25x = 1,770.83 × 811.40
  4. Step 4: Simplify right side
    1,283.25x = 1,436,842.98
  5. Step 5: Solve for x
    x = 1,436,842.98/1,283.25
  6. Step 6: Final answer
    x = 1,119.69

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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.