Home / 12,140.20-18,210.30-9,679.78

Finding the Fourth Proportional to 12,140.20, 18,210.30 and 9,679.78

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Solution

The fourth proportional to 12,140.20, 18,210.30 and 9,679.78 is: 14,519.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,140.20 : 18,210.30 = 9,679.78 : x
  2. Step 2: Convert to fraction form
    12,140.20/18,210.30 = 9,679.78/x
  3. Step 3: Cross multiply
    12,140.20x = 18,210.30 × 9,679.78
  4. Step 4: Simplify right side
    12,140.20x = 176,271,697.73
  5. Step 5: Solve for x
    x = 176,271,697.73/12,140.20
  6. Step 6: Final answer
    x = 14,519.67

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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.