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Finding the Fourth Proportional to 69,660, 104,490 and 20,412

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Solution

The fourth proportional to 69,660, 104,490 and 20,412 is: 30,618

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,660 : 104,490 = 20,412 : x
  2. Step 2: Convert to fraction form
    69,660/104,490 = 20,412/x
  3. Step 3: Cross multiply
    69,660x = 104,490 × 20,412
  4. Step 4: Simplify right side
    69,660x = 2,132,849,880
  5. Step 5: Solve for x
    x = 2,132,849,880/69,660
  6. Step 6: Final answer
    x = 30,618

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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.