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Finding the Fourth Proportional to 19,136.40, 28,672.20 and 12,559.20

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Solution

The fourth proportional to 19,136.40, 28,672.20 and 12,559.20 is: 18,817.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,136.40 : 28,672.20 = 12,559.20 : x
  2. Step 2: Convert to fraction form
    19,136.40/28,672.20 = 12,559.20/x
  3. Step 3: Cross multiply
    19,136.40x = 28,672.20 × 12,559.20
  4. Step 4: Simplify right side
    19,136.40x = 360,099,894.24
  5. Step 5: Solve for x
    x = 360,099,894.24/19,136.40
  6. Step 6: Final answer
    x = 18,817.54

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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.