Home / 3,121.20-4,307.40-2,127.60

Finding the Fourth Proportional to 3,121.20, 4,307.40 and 2,127.60

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Solution

The fourth proportional to 3,121.20, 4,307.40 and 2,127.60 is: 2,936.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.20 : 4,307.40 = 2,127.60 : x
  2. Step 2: Convert to fraction form
    3,121.20/4,307.40 = 2,127.60/x
  3. Step 3: Cross multiply
    3,121.20x = 4,307.40 × 2,127.60
  4. Step 4: Simplify right side
    3,121.20x = 9,164,424.24
  5. Step 5: Solve for x
    x = 9,164,424.24/3,121.20
  6. Step 6: Final answer
    x = 2,936.19

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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.