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Finding the Fourth Proportional to 19,191, 28,774.21 and 13,251.25

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Solution

The fourth proportional to 19,191, 28,774.21 and 13,251.25 is: 19,868.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,191 : 28,774.21 = 13,251.25 : x
  2. Step 2: Convert to fraction form
    19,191/28,774.21 = 13,251.25/x
  3. Step 3: Cross multiply
    19,191x = 28,774.21 × 13,251.25
  4. Step 4: Simplify right side
    19,191x = 381,294,250.26
  5. Step 5: Solve for x
    x = 381,294,250.26/19,191
  6. Step 6: Final answer
    x = 19,868.39

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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.