Home / 20,855.17-28,779.10-12,366.88

Finding the Fourth Proportional to 20,855.17, 28,779.10 and 12,366.88

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Solution

The fourth proportional to 20,855.17, 28,779.10 and 12,366.88 is: 17,065.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.17 : 28,779.10 = 12,366.88 : x
  2. Step 2: Convert to fraction form
    20,855.17/28,779.10 = 12,366.88/x
  3. Step 3: Cross multiply
    20,855.17x = 28,779.10 × 12,366.88
  4. Step 4: Simplify right side
    20,855.17x = 355,907,573.34
  5. Step 5: Solve for x
    x = 355,907,573.34/20,855.17
  6. Step 6: Final answer
    x = 17,065.67

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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.