Home / 2,119.23-3,178.78-657.99

Finding the Fourth Proportional to 2,119.23, 3,178.78 and 657.99

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Solution

The fourth proportional to 2,119.23, 3,178.78 and 657.99 is: 986.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.23 : 3,178.78 = 657.99 : x
  2. Step 2: Convert to fraction form
    2,119.23/3,178.78 = 657.99/x
  3. Step 3: Cross multiply
    2,119.23x = 3,178.78 × 657.99
  4. Step 4: Simplify right side
    2,119.23x = 2,091,603.81
  5. Step 5: Solve for x
    x = 2,091,603.81/2,119.23
  6. Step 6: Final answer
    x = 986.96

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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.