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Finding the Fourth Proportional to 69,929, 104,911.26 and 20,681

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Solution

The fourth proportional to 69,929, 104,911.26 and 20,681 is: 31,026.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,929 : 104,911.26 = 20,681 : x
  2. Step 2: Convert to fraction form
    69,929/104,911.26 = 20,681/x
  3. Step 3: Cross multiply
    69,929x = 104,911.26 × 20,681
  4. Step 4: Simplify right side
    69,929x = 2,169,669,768.06
  5. Step 5: Solve for x
    x = 2,169,669,768.06/69,929
  6. Step 6: Final answer
    x = 31,026.75

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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.