Home / 12,980.88-19,471.32-4,215.72

Finding the Fourth Proportional to 12,980.88, 19,471.32 and 4,215.72

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Solution

The fourth proportional to 12,980.88, 19,471.32 and 4,215.72 is: 6,323.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,980.88 : 19,471.32 = 4,215.72 : x
  2. Step 2: Convert to fraction form
    12,980.88/19,471.32 = 4,215.72/x
  3. Step 3: Cross multiply
    12,980.88x = 19,471.32 × 4,215.72
  4. Step 4: Simplify right side
    12,980.88x = 82,085,633.15
  5. Step 5: Solve for x
    x = 82,085,633.15/12,980.88
  6. Step 6: Final answer
    x = 6,323.58

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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.