Home / 1,586.21-2,186.78-1,321.05

Finding the Fourth Proportional to 1,586.21, 2,186.78 and 1,321.05

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Solution

The fourth proportional to 1,586.21, 2,186.78 and 1,321.05 is: 1,821.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.21 : 2,186.78 = 1,321.05 : x
  2. Step 2: Convert to fraction form
    1,586.21/2,186.78 = 1,321.05/x
  3. Step 3: Cross multiply
    1,586.21x = 2,186.78 × 1,321.05
  4. Step 4: Simplify right side
    1,586.21x = 2,888,839.11
  5. Step 5: Solve for x
    x = 2,888,839.11/1,586.21
  6. Step 6: Final answer
    x = 1,821.22

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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.