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Finding the Fourth Proportional to 53,791.86, 80,688.15 and 18,731.40

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Solution

The fourth proportional to 53,791.86, 80,688.15 and 18,731.40 is: 28,097.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,791.86 : 80,688.15 = 18,731.40 : x
  2. Step 2: Convert to fraction form
    53,791.86/80,688.15 = 18,731.40/x
  3. Step 3: Cross multiply
    53,791.86x = 80,688.15 × 18,731.40
  4. Step 4: Simplify right side
    53,791.86x = 1,511,402,012.91
  5. Step 5: Solve for x
    x = 1,511,402,012.91/53,791.86
  6. Step 6: Final answer
    x = 28,097.23

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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.