Home / 1,571.70-2,168.78-942.21

Finding the Fourth Proportional to 1,571.70, 2,168.78 and 942.21

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Solution

The fourth proportional to 1,571.70, 2,168.78 and 942.21 is: 1,300.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.70 : 2,168.78 = 942.21 : x
  2. Step 2: Convert to fraction form
    1,571.70/2,168.78 = 942.21/x
  3. Step 3: Cross multiply
    1,571.70x = 2,168.78 × 942.21
  4. Step 4: Simplify right side
    1,571.70x = 2,043,448.56
  5. Step 5: Solve for x
    x = 2,043,448.56/1,571.70
  6. Step 6: Final answer
    x = 1,300.15

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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.