Home / 3,121.20-4,307.16-1,724

Finding the Fourth Proportional to 3,121.20, 4,307.16 and 1,724

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Solution

The fourth proportional to 3,121.20, 4,307.16 and 1,724 is: 2,379.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.20 : 4,307.16 = 1,724 : x
  2. Step 2: Convert to fraction form
    3,121.20/4,307.16 = 1,724/x
  3. Step 3: Cross multiply
    3,121.20x = 4,307.16 × 1,724
  4. Step 4: Simplify right side
    3,121.20x = 7,425,543.84
  5. Step 5: Solve for x
    x = 7,425,543.84/3,121.20
  6. Step 6: Final answer
    x = 2,379.07

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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.