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Finding the Fourth Proportional to 3,979.62, 5,491.80 and 2,300.90

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Solution

The fourth proportional to 3,979.62, 5,491.80 and 2,300.90 is: 3,175.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.62 : 5,491.80 = 2,300.90 : x
  2. Step 2: Convert to fraction form
    3,979.62/5,491.80 = 2,300.90/x
  3. Step 3: Cross multiply
    3,979.62x = 5,491.80 × 2,300.90
  4. Step 4: Simplify right side
    3,979.62x = 12,636,055.16
  5. Step 5: Solve for x
    x = 12,636,055.16/3,979.62
  6. Step 6: Final answer
    x = 3,175.19

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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.