Home / 20,981.45-31,485.45-19,011.09

Finding the Fourth Proportional to 20,981.45, 31,485.45 and 19,011.09

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Solution

The fourth proportional to 20,981.45, 31,485.45 and 19,011.09 is: 28,528.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.45 : 31,485.45 = 19,011.09 : x
  2. Step 2: Convert to fraction form
    20,981.45/31,485.45 = 19,011.09/x
  3. Step 3: Cross multiply
    20,981.45x = 31,485.45 × 19,011.09
  4. Step 4: Simplify right side
    20,981.45x = 598,572,723.64
  5. Step 5: Solve for x
    x = 598,572,723.64/20,981.45
  6. Step 6: Final answer
    x = 28,528.67

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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.