Home / 20,856.48-28,776.24-13,408.80

Finding the Fourth Proportional to 20,856.48, 28,776.24 and 13,408.80

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Solution

The fourth proportional to 20,856.48, 28,776.24 and 13,408.80 is: 18,500.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.48 : 28,776.24 = 13,408.80 : x
  2. Step 2: Convert to fraction form
    20,856.48/28,776.24 = 13,408.80/x
  3. Step 3: Cross multiply
    20,856.48x = 28,776.24 × 13,408.80
  4. Step 4: Simplify right side
    20,856.48x = 385,854,846.91
  5. Step 5: Solve for x
    x = 385,854,846.91/20,856.48
  6. Step 6: Final answer
    x = 18,500.48

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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.