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Finding the Fourth Proportional to 49,321.36, 73,978.80 and 21,240.28

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Solution

The fourth proportional to 49,321.36, 73,978.80 and 21,240.28 is: 31,859.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    49,321.36 : 73,978.80 = 21,240.28 : x
  2. Step 2: Convert to fraction form
    49,321.36/73,978.80 = 21,240.28/x
  3. Step 3: Cross multiply
    49,321.36x = 73,978.80 × 21,240.28
  4. Step 4: Simplify right side
    49,321.36x = 1,571,330,426.06
  5. Step 5: Solve for x
    x = 1,571,330,426.06/49,321.36
  6. Step 6: Final answer
    x = 31,859.02

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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.