Home / 13,945.61-20,918.43-5,178.78

Finding the Fourth Proportional to 13,945.61, 20,918.43 and 5,178.78

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Solution

The fourth proportional to 13,945.61, 20,918.43 and 5,178.78 is: 7,768.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,945.61 : 20,918.43 = 5,178.78 : x
  2. Step 2: Convert to fraction form
    13,945.61/20,918.43 = 5,178.78/x
  3. Step 3: Cross multiply
    13,945.61x = 20,918.43 × 5,178.78
  4. Step 4: Simplify right side
    13,945.61x = 108,331,946.92
  5. Step 5: Solve for x
    x = 108,331,946.92/13,945.61
  6. Step 6: Final answer
    x = 7,768.17

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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.