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Finding the Fourth Proportional to 3,621.91, 4,979.01 and 3,115.91

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Solution

The fourth proportional to 3,621.91, 4,979.01 and 3,115.91 is: 4,283.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,621.91 : 4,979.01 = 3,115.91 : x
  2. Step 2: Convert to fraction form
    3,621.91/4,979.01 = 3,115.91/x
  3. Step 3: Cross multiply
    3,621.91x = 4,979.01 × 3,115.91
  4. Step 4: Simplify right side
    3,621.91x = 15,514,159.50
  5. Step 5: Solve for x
    x = 15,514,159.50/3,621.91
  6. Step 6: Final answer
    x = 4,283.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.