Home / 12,390.78-18,586.18-3,625.70

Finding the Fourth Proportional to 12,390.78, 18,586.18 and 3,625.70

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Solution

The fourth proportional to 12,390.78, 18,586.18 and 3,625.70 is: 5,438.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.78 : 18,586.18 = 3,625.70 : x
  2. Step 2: Convert to fraction form
    12,390.78/18,586.18 = 3,625.70/x
  3. Step 3: Cross multiply
    12,390.78x = 18,586.18 × 3,625.70
  4. Step 4: Simplify right side
    12,390.78x = 67,387,912.83
  5. Step 5: Solve for x
    x = 67,387,912.83/12,390.78
  6. Step 6: Final answer
    x = 5,438.55

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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.