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Finding the Fourth Proportional to 2,847.69, 3,930.15 and 1,728.92

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Solution

The fourth proportional to 2,847.69, 3,930.15 and 1,728.92 is: 2,386.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,847.69 : 3,930.15 = 1,728.92 : x
  2. Step 2: Convert to fraction form
    2,847.69/3,930.15 = 1,728.92/x
  3. Step 3: Cross multiply
    2,847.69x = 3,930.15 × 1,728.92
  4. Step 4: Simplify right side
    2,847.69x = 6,794,895.29
  5. Step 5: Solve for x
    x = 6,794,895.29/2,847.69
  6. Step 6: Final answer
    x = 2,386.11

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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.