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Finding the Fourth Proportional to 76,804.42, 115,215.84 and 72,605.38

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Solution

The fourth proportional to 76,804.42, 115,215.84 and 72,605.38 is: 108,916.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,804.42 : 115,215.84 = 72,605.38 : x
  2. Step 2: Convert to fraction form
    76,804.42/115,215.84 = 72,605.38/x
  3. Step 3: Cross multiply
    76,804.42x = 115,215.84 × 72,605.38
  4. Step 4: Simplify right side
    76,804.42x = 8,365,289,845.22
  5. Step 5: Solve for x
    x = 8,365,289,845.22/76,804.42
  6. Step 6: Final answer
    x = 108,916.78

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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.