Home / 12,520.20-18,729.10-11,291.40

Finding the Fourth Proportional to 12,520.20, 18,729.10 and 11,291.40

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Solution

The fourth proportional to 12,520.20, 18,729.10 and 11,291.40 is: 16,890.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,520.20 : 18,729.10 = 11,291.40 : x
  2. Step 2: Convert to fraction form
    12,520.20/18,729.10 = 11,291.40/x
  3. Step 3: Cross multiply
    12,520.20x = 18,729.10 × 11,291.40
  4. Step 4: Simplify right side
    12,520.20x = 211,477,759.74
  5. Step 5: Solve for x
    x = 211,477,759.74/12,520.20
  6. Step 6: Final answer
    x = 16,890.93

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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.