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Finding the Fourth Proportional to 72,319.78, 99,804.99 and 40,486.78

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Solution

The fourth proportional to 72,319.78, 99,804.99 and 40,486.78 is: 55,873.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,319.78 : 99,804.99 = 40,486.78 : x
  2. Step 2: Convert to fraction form
    72,319.78/99,804.99 = 40,486.78/x
  3. Step 3: Cross multiply
    72,319.78x = 99,804.99 × 40,486.78
  4. Step 4: Simplify right side
    72,319.78x = 4,040,782,673.03
  5. Step 5: Solve for x
    x = 4,040,782,673.03/72,319.78
  6. Step 6: Final answer
    x = 55,873.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.