Home / 19,780.20-29,643.30-12,738.60

Finding the Fourth Proportional to 19,780.20, 29,643.30 and 12,738.60

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Solution

The fourth proportional to 19,780.20, 29,643.30 and 12,738.60 is: 19,090.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,780.20 : 29,643.30 = 12,738.60 : x
  2. Step 2: Convert to fraction form
    19,780.20/29,643.30 = 12,738.60/x
  3. Step 3: Cross multiply
    19,780.20x = 29,643.30 × 12,738.60
  4. Step 4: Simplify right side
    19,780.20x = 377,614,141.38
  5. Step 5: Solve for x
    x = 377,614,141.38/19,780.20
  6. Step 6: Final answer
    x = 19,090.51

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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.