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Finding the Fourth Proportional to 128,902.82, 177,883.22 and 71,538.81

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Solution

The fourth proportional to 128,902.82, 177,883.22 and 71,538.81 is: 98,722.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,902.82 : 177,883.22 = 71,538.81 : x
  2. Step 2: Convert to fraction form
    128,902.82/177,883.22 = 71,538.81/x
  3. Step 3: Cross multiply
    128,902.82x = 177,883.22 × 71,538.81
  4. Step 4: Simplify right side
    128,902.82x = 12,725,553,520.07
  5. Step 5: Solve for x
    x = 12,725,553,520.07/128,902.82
  6. Step 6: Final answer
    x = 98,722.07

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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.