Home / 12,987.12-19,456.20-6,405.60

Finding the Fourth Proportional to 12,987.12, 19,456.20 and 6,405.60

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Solution

The fourth proportional to 12,987.12, 19,456.20 and 6,405.60 is: 9,596.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.12 : 19,456.20 = 6,405.60 : x
  2. Step 2: Convert to fraction form
    12,987.12/19,456.20 = 6,405.60/x
  3. Step 3: Cross multiply
    12,987.12x = 19,456.20 × 6,405.60
  4. Step 4: Simplify right side
    12,987.12x = 124,628,634.72
  5. Step 5: Solve for x
    x = 124,628,634.72/12,987.12
  6. Step 6: Final answer
    x = 9,596.33

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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.