Home / 5,118.91-7,678.51-1,998.79

Finding the Fourth Proportional to 5,118.91, 7,678.51 and 1,998.79

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Solution

The fourth proportional to 5,118.91, 7,678.51 and 1,998.79 is: 2,998.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,118.91 : 7,678.51 = 1,998.79 : x
  2. Step 2: Convert to fraction form
    5,118.91/7,678.51 = 1,998.79/x
  3. Step 3: Cross multiply
    5,118.91x = 7,678.51 × 1,998.79
  4. Step 4: Simplify right side
    5,118.91x = 15,347,704.81
  5. Step 5: Solve for x
    x = 15,347,704.81/5,118.91
  6. Step 6: Final answer
    x = 2,998.24

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Half scale
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Double scale
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Similar ratio
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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.