Home / 12,987.40-19,481.10-4,222.60

Finding the Fourth Proportional to 12,987.40, 19,481.10 and 4,222.60

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Solution

The fourth proportional to 12,987.40, 19,481.10 and 4,222.60 is: 6,333.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.40 : 19,481.10 = 4,222.60 : x
  2. Step 2: Convert to fraction form
    12,987.40/19,481.10 = 4,222.60/x
  3. Step 3: Cross multiply
    12,987.40x = 19,481.10 × 4,222.60
  4. Step 4: Simplify right side
    12,987.40x = 82,260,892.86
  5. Step 5: Solve for x
    x = 82,260,892.86/12,987.40
  6. Step 6: Final answer
    x = 6,333.90

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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.