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Finding the Fourth Proportional to 4,995.78, 6,891.99 and 3,005.21

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Solution

The fourth proportional to 4,995.78, 6,891.99 and 3,005.21 is: 4,145.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,995.78 : 6,891.99 = 3,005.21 : x
  2. Step 2: Convert to fraction form
    4,995.78/6,891.99 = 3,005.21/x
  3. Step 3: Cross multiply
    4,995.78x = 6,891.99 × 3,005.21
  4. Step 4: Simplify right side
    4,995.78x = 20,711,842.81
  5. Step 5: Solve for x
    x = 20,711,842.81/4,995.78
  6. Step 6: Final answer
    x = 4,145.87

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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.