Home / 12,855.20-19,311.60-12,330.40

Finding the Fourth Proportional to 12,855.20, 19,311.60 and 12,330.40

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Solution

The fourth proportional to 12,855.20, 19,311.60 and 12,330.40 is: 18,523.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.20 : 19,311.60 = 12,330.40 : x
  2. Step 2: Convert to fraction form
    12,855.20/19,311.60 = 12,330.40/x
  3. Step 3: Cross multiply
    12,855.20x = 19,311.60 × 12,330.40
  4. Step 4: Simplify right side
    12,855.20x = 238,119,752.64
  5. Step 5: Solve for x
    x = 238,119,752.64/12,855.20
  6. Step 6: Final answer
    x = 18,523.22

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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.