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Finding the Fourth Proportional to 11,220.12, 16,830.72 and 3,429

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Solution

The fourth proportional to 11,220.12, 16,830.72 and 3,429 is: 5,143.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,220.12 : 16,830.72 = 3,429 : x
  2. Step 2: Convert to fraction form
    11,220.12/16,830.72 = 3,429/x
  3. Step 3: Cross multiply
    11,220.12x = 16,830.72 × 3,429
  4. Step 4: Simplify right side
    11,220.12x = 57,712,538.88
  5. Step 5: Solve for x
    x = 57,712,538.88/11,220.12
  6. Step 6: Final answer
    x = 5,143.67

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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.