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Finding the Fourth Proportional to 53,978.80, 80,968.20 and 18,913.90

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Solution

The fourth proportional to 53,978.80, 80,968.20 and 18,913.90 is: 28,370.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,978.80 : 80,968.20 = 18,913.90 : x
  2. Step 2: Convert to fraction form
    53,978.80/80,968.20 = 18,913.90/x
  3. Step 3: Cross multiply
    53,978.80x = 80,968.20 × 18,913.90
  4. Step 4: Simplify right side
    53,978.80x = 1,531,424,437.98
  5. Step 5: Solve for x
    x = 1,531,424,437.98/53,978.80
  6. Step 6: Final answer
    x = 28,370.85

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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.