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Finding the Fourth Proportional to 128,896.70, 177,940.95 and 81,223.34

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Solution

The fourth proportional to 128,896.70, 177,940.95 and 81,223.34 is: 112,128.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,896.70 : 177,940.95 = 81,223.34 : x
  2. Step 2: Convert to fraction form
    128,896.70/177,940.95 = 81,223.34/x
  3. Step 3: Cross multiply
    128,896.70x = 177,940.95 × 81,223.34
  4. Step 4: Simplify right side
    128,896.70x = 14,452,958,281.77
  5. Step 5: Solve for x
    x = 14,452,958,281.77/128,896.70
  6. Step 6: Final answer
    x = 112,128.23

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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.