Home / 20,388.72-28,136.22-12,430.44

Finding the Fourth Proportional to 20,388.72, 28,136.22 and 12,430.44

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Solution

The fourth proportional to 20,388.72, 28,136.22 and 12,430.44 is: 17,153.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.72 : 28,136.22 = 12,430.44 : x
  2. Step 2: Convert to fraction form
    20,388.72/28,136.22 = 12,430.44/x
  3. Step 3: Cross multiply
    20,388.72x = 28,136.22 × 12,430.44
  4. Step 4: Simplify right side
    20,388.72x = 349,745,594.54
  5. Step 5: Solve for x
    x = 349,745,594.54/20,388.72
  6. Step 6: Final answer
    x = 17,153.88

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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.