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Finding the Fourth Proportional to 19,128.78, 28,747.80 and 19,019.40

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Solution

The fourth proportional to 19,128.78, 28,747.80 and 19,019.40 is: 28,583.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,128.78 : 28,747.80 = 19,019.40 : x
  2. Step 2: Convert to fraction form
    19,128.78/28,747.80 = 19,019.40/x
  3. Step 3: Cross multiply
    19,128.78x = 28,747.80 × 19,019.40
  4. Step 4: Simplify right side
    19,128.78x = 546,765,907.32
  5. Step 5: Solve for x
    x = 546,765,907.32/19,128.78
  6. Step 6: Final answer
    x = 28,583.42

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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.