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Finding the Fourth Proportional to 81,321.88, 112,224.75 and 45,515.20

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Solution

The fourth proportional to 81,321.88, 112,224.75 and 45,515.20 is: 62,811.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.88 : 112,224.75 = 45,515.20 : x
  2. Step 2: Convert to fraction form
    81,321.88/112,224.75 = 45,515.20/x
  3. Step 3: Cross multiply
    81,321.88x = 112,224.75 × 45,515.20
  4. Step 4: Simplify right side
    81,321.88x = 5,107,931,380.08
  5. Step 5: Solve for x
    x = 5,107,931,380.08/81,321.88
  6. Step 6: Final answer
    x = 62,811.28

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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.