Home / 20,856.40-28,782.42-12,679.99

Finding the Fourth Proportional to 20,856.40, 28,782.42 and 12,679.99

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Solution

The fourth proportional to 20,856.40, 28,782.42 and 12,679.99 is: 17,498.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.40 : 28,782.42 = 12,679.99 : x
  2. Step 2: Convert to fraction form
    20,856.40/28,782.42 = 12,679.99/x
  3. Step 3: Cross multiply
    20,856.40x = 28,782.42 × 12,679.99
  4. Step 4: Simplify right side
    20,856.40x = 364,960,797.78
  5. Step 5: Solve for x
    x = 364,960,797.78/20,856.40
  6. Step 6: Final answer
    x = 17,498.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.