Home / 12,485.90-18,728.69-3,125.88

Finding the Fourth Proportional to 12,485.90, 18,728.69 and 3,125.88

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Solution

The fourth proportional to 12,485.90, 18,728.69 and 3,125.88 is: 4,688.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,485.90 : 18,728.69 = 3,125.88 : x
  2. Step 2: Convert to fraction form
    12,485.90/18,728.69 = 3,125.88/x
  3. Step 3: Cross multiply
    12,485.90x = 18,728.69 × 3,125.88
  4. Step 4: Simplify right side
    12,485.90x = 58,543,621.87
  5. Step 5: Solve for x
    x = 58,543,621.87/12,485.90
  6. Step 6: Final answer
    x = 4,688.78

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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.