Home / 1,284.14-1,770.35-811.80

Finding the Fourth Proportional to 1,284.14, 1,770.35 and 811.80

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Solution

The fourth proportional to 1,284.14, 1,770.35 and 811.80 is: 1,119.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.14 : 1,770.35 = 811.80 : x
  2. Step 2: Convert to fraction form
    1,284.14/1,770.35 = 811.80/x
  3. Step 3: Cross multiply
    1,284.14x = 1,770.35 × 811.80
  4. Step 4: Simplify right side
    1,284.14x = 1,437,170.69
  5. Step 5: Solve for x
    x = 1,437,170.69/1,284.14
  6. Step 6: Final answer
    x = 1,119.17

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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.