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Finding the Fourth Proportional to 12,485.94, 18,728.97 and 3,720.93

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Solution

The fourth proportional to 12,485.94, 18,728.97 and 3,720.93 is: 5,581.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.94 : 18,728.97 = 3,720.93 : x
  2. Step 2: Convert to fraction form
    12,485.94/18,728.97 = 3,720.93/x
  3. Step 3: Cross multiply
    12,485.94x = 18,728.97 × 3,720.93
  4. Step 4: Simplify right side
    12,485.94x = 69,689,186.34
  5. Step 5: Solve for x
    x = 69,689,186.34/12,485.94
  6. Step 6: Final answer
    x = 5,581.41

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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.