Home / 3,121.65-4,681.62-1,172.79

Finding the Fourth Proportional to 3,121.65, 4,681.62 and 1,172.79

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Solution

The fourth proportional to 3,121.65, 4,681.62 and 1,172.79 is: 1,758.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.65 : 4,681.62 = 1,172.79 : x
  2. Step 2: Convert to fraction form
    3,121.65/4,681.62 = 1,172.79/x
  3. Step 3: Cross multiply
    3,121.65x = 4,681.62 × 1,172.79
  4. Step 4: Simplify right side
    3,121.65x = 5,490,557.12
  5. Step 5: Solve for x
    x = 5,490,557.12/3,121.65
  6. Step 6: Final answer
    x = 1,758.86

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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.