Home / 3,121.10-4,681.66-812.60

Finding the Fourth Proportional to 3,121.10, 4,681.66 and 812.60

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Solution

The fourth proportional to 3,121.10, 4,681.66 and 812.60 is: 1,218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.10 : 4,681.66 = 812.60 : x
  2. Step 2: Convert to fraction form
    3,121.10/4,681.66 = 812.60/x
  3. Step 3: Cross multiply
    3,121.10x = 4,681.66 × 812.60
  4. Step 4: Simplify right side
    3,121.10x = 3,804,316.92
  5. Step 5: Solve for x
    x = 3,804,316.92/3,121.10
  6. Step 6: Final answer
    x = 1,218.90

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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.