Home / 3,121.21-4,681.80-812.71

Finding the Fourth Proportional to 3,121.21, 4,681.80 and 812.71

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Solution

The fourth proportional to 3,121.21, 4,681.80 and 812.71 is: 1,219.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.21 : 4,681.80 = 812.71 : x
  2. Step 2: Convert to fraction form
    3,121.21/4,681.80 = 812.71/x
  3. Step 3: Cross multiply
    3,121.21x = 4,681.80 × 812.71
  4. Step 4: Simplify right side
    3,121.21x = 3,804,945.68
  5. Step 5: Solve for x
    x = 3,804,945.68/3,121.21
  6. Step 6: Final answer
    x = 1,219.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.