Home / 20,489.21-30,728.19-12,981.50

Finding the Fourth Proportional to 20,489.21, 30,728.19 and 12,981.50

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Solution

The fourth proportional to 20,489.21, 30,728.19 and 12,981.50 is: 19,468.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.21 : 30,728.19 = 12,981.50 : x
  2. Step 2: Convert to fraction form
    20,489.21/30,728.19 = 12,981.50/x
  3. Step 3: Cross multiply
    20,489.21x = 30,728.19 × 12,981.50
  4. Step 4: Simplify right side
    20,489.21x = 398,898,075.31
  5. Step 5: Solve for x
    x = 398,898,075.31/20,489.21
  6. Step 6: Final answer
    x = 19,468.69

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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.