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Finding the Fourth Proportional to 43,578.95, 65,359.81 and 11,980.86

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Solution

The fourth proportional to 43,578.95, 65,359.81 and 11,980.86 is: 17,968.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,578.95 : 65,359.81 = 11,980.86 : x
  2. Step 2: Convert to fraction form
    43,578.95/65,359.81 = 11,980.86/x
  3. Step 3: Cross multiply
    43,578.95x = 65,359.81 × 11,980.86
  4. Step 4: Simplify right side
    43,578.95x = 783,066,733.24
  5. Step 5: Solve for x
    x = 783,066,733.24/43,578.95
  6. Step 6: Final answer
    x = 17,968.92

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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.