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Finding the Fourth Proportional to 53,978.97, 80,968.47 and 18,918.63

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Solution

The fourth proportional to 53,978.97, 80,968.47 and 18,918.63 is: 28,377.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,978.97 : 80,968.47 = 18,918.63 : x
  2. Step 2: Convert to fraction form
    53,978.97/80,968.47 = 18,918.63/x
  3. Step 3: Cross multiply
    53,978.97x = 80,968.47 × 18,918.63
  4. Step 4: Simplify right side
    53,978.97x = 1,531,812,525.60
  5. Step 5: Solve for x
    x = 1,531,812,525.60/53,978.97
  6. Step 6: Final answer
    x = 28,377.95

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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.