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Finding the Fourth Proportional to 81,209.72, 112,068.90 and 45,399.56

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Solution

The fourth proportional to 81,209.72, 112,068.90 and 45,399.56 is: 62,651.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,209.72 : 112,068.90 = 45,399.56 : x
  2. Step 2: Convert to fraction form
    81,209.72/112,068.90 = 45,399.56/x
  3. Step 3: Cross multiply
    81,209.72x = 112,068.90 × 45,399.56
  4. Step 4: Simplify right side
    81,209.72x = 5,087,878,749.68
  5. Step 5: Solve for x
    x = 5,087,878,749.68/81,209.72
  6. Step 6: Final answer
    x = 62,651.11

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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.