Home / 12,891.20-19,322.40-6,648.80

Finding the Fourth Proportional to 12,891.20, 19,322.40 and 6,648.80

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Solution

The fourth proportional to 12,891.20, 19,322.40 and 6,648.80 is: 9,965.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.20 : 19,322.40 = 6,648.80 : x
  2. Step 2: Convert to fraction form
    12,891.20/19,322.40 = 6,648.80/x
  3. Step 3: Cross multiply
    12,891.20x = 19,322.40 × 6,648.80
  4. Step 4: Simplify right side
    12,891.20x = 128,470,773.12
  5. Step 5: Solve for x
    x = 128,470,773.12/12,891.20
  6. Step 6: Final answer
    x = 9,965.77

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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.