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Finding the Fourth Proportional to 19,136.88, 28,699.74 and 7,447.32

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Solution

The fourth proportional to 19,136.88, 28,699.74 and 7,447.32 is: 11,168.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,136.88 : 28,699.74 = 7,447.32 : x
  2. Step 2: Convert to fraction form
    19,136.88/28,699.74 = 7,447.32/x
  3. Step 3: Cross multiply
    19,136.88x = 28,699.74 × 7,447.32
  4. Step 4: Simplify right side
    19,136.88x = 213,736,147.70
  5. Step 5: Solve for x
    x = 213,736,147.70/19,136.88
  6. Step 6: Final answer
    x = 11,168.81

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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.