Home / 20,490.24-30,657.60-12,679.68

Finding the Fourth Proportional to 20,490.24, 30,657.60 and 12,679.68

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Solution

The fourth proportional to 20,490.24, 30,657.60 and 12,679.68 is: 18,971.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.24 : 30,657.60 = 12,679.68 : x
  2. Step 2: Convert to fraction form
    20,490.24/30,657.60 = 12,679.68/x
  3. Step 3: Cross multiply
    20,490.24x = 30,657.60 × 12,679.68
  4. Step 4: Simplify right side
    20,490.24x = 388,728,557.57
  5. Step 5: Solve for x
    x = 388,728,557.57/20,490.24
  6. Step 6: Final answer
    x = 18,971.40

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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.