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Finding the Fourth Proportional to 28,749.26, 39,640.03 and 19,679.00

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Solution

The fourth proportional to 28,749.26, 39,640.03 and 19,679.00 is: 27,133.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,749.26 : 39,640.03 = 19,679.00 : x
  2. Step 2: Convert to fraction form
    28,749.26/39,640.03 = 19,679.00/x
  3. Step 3: Cross multiply
    28,749.26x = 39,640.03 × 19,679.00
  4. Step 4: Simplify right side
    28,749.26x = 780,075,902.97
  5. Step 5: Solve for x
    x = 780,075,902.97/28,749.26
  6. Step 6: Final answer
    x = 27,133.77

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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.