Home / 12,485.91-18,731.70-3,720.09

Finding the Fourth Proportional to 12,485.91, 18,731.70 and 3,720.09

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Solution

The fourth proportional to 12,485.91, 18,731.70 and 3,720.09 is: 5,580.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.91 : 18,731.70 = 3,720.09 : x
  2. Step 2: Convert to fraction form
    12,485.91/18,731.70 = 3,720.09/x
  3. Step 3: Cross multiply
    12,485.91x = 18,731.70 × 3,720.09
  4. Step 4: Simplify right side
    12,485.91x = 69,683,609.85
  5. Step 5: Solve for x
    x = 69,683,609.85/12,485.91
  6. Step 6: Final answer
    x = 5,580.98

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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.