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Finding the Fourth Proportional to 3,078.80, 4,617.74 and 998.98

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Solution

The fourth proportional to 3,078.80, 4,617.74 and 998.98 is: 1,498.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.80 : 4,617.74 = 998.98 : x
  2. Step 2: Convert to fraction form
    3,078.80/4,617.74 = 998.98/x
  3. Step 3: Cross multiply
    3,078.80x = 4,617.74 × 998.98
  4. Step 4: Simplify right side
    3,078.80x = 4,613,029.91
  5. Step 5: Solve for x
    x = 4,613,029.91/3,078.80
  6. Step 6: Final answer
    x = 1,498.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.