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Finding the Fourth Proportional to 78,673.86, 118,021.08 and 28,777.45

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Solution

The fourth proportional to 78,673.86, 118,021.08 and 28,777.45 is: 43,169.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,673.86 : 118,021.08 = 28,777.45 : x
  2. Step 2: Convert to fraction form
    78,673.86/118,021.08 = 28,777.45/x
  3. Step 3: Cross multiply
    78,673.86x = 118,021.08 × 28,777.45
  4. Step 4: Simplify right side
    78,673.86x = 3,396,345,851.92
  5. Step 5: Solve for x
    x = 3,396,345,851.92/78,673.86
  6. Step 6: Final answer
    x = 43,169.94

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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.