Home / 12,389.21-18,578.58-4,991.69

Finding the Fourth Proportional to 12,389.21, 18,578.58 and 4,991.69

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Solution

The fourth proportional to 12,389.21, 18,578.58 and 4,991.69 is: 7,485.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,389.21 : 18,578.58 = 4,991.69 : x
  2. Step 2: Convert to fraction form
    12,389.21/18,578.58 = 4,991.69/x
  3. Step 3: Cross multiply
    12,389.21x = 18,578.58 × 4,991.69
  4. Step 4: Simplify right side
    12,389.21x = 92,738,463.30
  5. Step 5: Solve for x
    x = 92,738,463.30/12,389.21
  6. Step 6: Final answer
    x = 7,485.42

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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.