Home / 10,855.20-14,980.10-6,139.65

Finding the Fourth Proportional to 10,855.20, 14,980.10 and 6,139.65

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Solution

The fourth proportional to 10,855.20, 14,980.10 and 6,139.65 is: 8,472.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,855.20 : 14,980.10 = 6,139.65 : x
  2. Step 2: Convert to fraction form
    10,855.20/14,980.10 = 6,139.65/x
  3. Step 3: Cross multiply
    10,855.20x = 14,980.10 × 6,139.65
  4. Step 4: Simplify right side
    10,855.20x = 91,972,540.27
  5. Step 5: Solve for x
    x = 91,972,540.27/10,855.20
  6. Step 6: Final answer
    x = 8,472.67

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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.