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Finding the Fourth Proportional to 33,390, 46,078.20 and 18,486

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Solution

The fourth proportional to 33,390, 46,078.20 and 18,486 is: 25,510.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    33,390 : 46,078.20 = 18,486 : x
  2. Step 2: Convert to fraction form
    33,390/46,078.20 = 18,486/x
  3. Step 3: Cross multiply
    33,390x = 46,078.20 × 18,486
  4. Step 4: Simplify right side
    33,390x = 851,801,605.20
  5. Step 5: Solve for x
    x = 851,801,605.20/33,390
  6. Step 6: Final answer
    x = 25,510.68

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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.