Home / 20,961.12-28,931.22-12,013.68

Finding the Fourth Proportional to 20,961.12, 28,931.22 and 12,013.68

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Solution

The fourth proportional to 20,961.12, 28,931.22 and 12,013.68 is: 16,581.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.12 : 28,931.22 = 12,013.68 : x
  2. Step 2: Convert to fraction form
    20,961.12/28,931.22 = 12,013.68/x
  3. Step 3: Cross multiply
    20,961.12x = 28,931.22 × 12,013.68
  4. Step 4: Simplify right side
    20,961.12x = 347,570,419.09
  5. Step 5: Solve for x
    x = 347,570,419.09/20,961.12
  6. Step 6: Final answer
    x = 16,581.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.