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Finding the Fourth Proportional to 81,676.45, 112,915.65 and 80,928.37

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Solution

The fourth proportional to 81,676.45, 112,915.65 and 80,928.37 is: 111,881.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,676.45 : 112,915.65 = 80,928.37 : x
  2. Step 2: Convert to fraction form
    81,676.45/112,915.65 = 80,928.37/x
  3. Step 3: Cross multiply
    81,676.45x = 112,915.65 × 80,928.37
  4. Step 4: Simplify right side
    81,676.45x = 9,138,079,501.99
  5. Step 5: Solve for x
    x = 9,138,079,501.99/81,676.45
  6. Step 6: Final answer
    x = 111,881.45

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1.5x scale

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.