Home / 12,987.90-19,469.88-4,218.30

Finding the Fourth Proportional to 12,987.90, 19,469.88 and 4,218.30

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Solution

The fourth proportional to 12,987.90, 19,469.88 and 4,218.30 is: 6,323.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.90 : 19,469.88 = 4,218.30 : x
  2. Step 2: Convert to fraction form
    12,987.90/19,469.88 = 4,218.30/x
  3. Step 3: Cross multiply
    12,987.90x = 19,469.88 × 4,218.30
  4. Step 4: Simplify right side
    12,987.90x = 82,129,794.80
  5. Step 5: Solve for x
    x = 82,129,794.80/12,987.90
  6. Step 6: Final answer
    x = 6,323.56

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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.