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Finding the Fourth Proportional to 69,505, 104,276.70 and 20,257

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Solution

The fourth proportional to 69,505, 104,276.70 and 20,257 is: 30,391.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,505 : 104,276.70 = 20,257 : x
  2. Step 2: Convert to fraction form
    69,505/104,276.70 = 20,257/x
  3. Step 3: Cross multiply
    69,505x = 104,276.70 × 20,257
  4. Step 4: Simplify right side
    69,505x = 2,112,333,111.90
  5. Step 5: Solve for x
    x = 2,112,333,111.90/69,505
  6. Step 6: Final answer
    x = 30,391.10

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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.