Home / 4,913.78-6,779.99-3,121.79

Finding the Fourth Proportional to 4,913.78, 6,779.99 and 3,121.79

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Solution

The fourth proportional to 4,913.78, 6,779.99 and 3,121.79 is: 4,307.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,913.78 : 6,779.99 = 3,121.79 : x
  2. Step 2: Convert to fraction form
    4,913.78/6,779.99 = 3,121.79/x
  3. Step 3: Cross multiply
    4,913.78x = 6,779.99 × 3,121.79
  4. Step 4: Simplify right side
    4,913.78x = 21,165,689.37
  5. Step 5: Solve for x
    x = 21,165,689.37/4,913.78
  6. Step 6: Final answer
    x = 4,307.41

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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.