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Finding the Fourth Proportional to 78,581.49, 108,491.45 and 54,699.45

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Solution

The fourth proportional to 78,581.49, 108,491.45 and 54,699.45 is: 75,519.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,581.49 : 108,491.45 = 54,699.45 : x
  2. Step 2: Convert to fraction form
    78,581.49/108,491.45 = 54,699.45/x
  3. Step 3: Cross multiply
    78,581.49x = 108,491.45 × 54,699.45
  4. Step 4: Simplify right side
    78,581.49x = 5,934,422,371.21
  5. Step 5: Solve for x
    x = 5,934,422,371.21/78,581.49
  6. Step 6: Final answer
    x = 75,519.34

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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.