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Finding the Fourth Proportional to 81,912.80, 114,911.20 and 81,912.80

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Solution

The fourth proportional to 81,912.80, 114,911.20 and 81,912.80 is: 114,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,912.80 : 114,911.20 = 81,912.80 : x
  2. Step 2: Convert to fraction form
    81,912.80/114,911.20 = 81,912.80/x
  3. Step 3: Cross multiply
    81,912.80x = 114,911.20 × 81,912.80
  4. Step 4: Simplify right side
    81,912.80x = 9,412,698,143.36
  5. Step 5: Solve for x
    x = 9,412,698,143.36/81,912.80
  6. Step 6: Final answer
    x = 114,911.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.