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Finding the Fourth Proportional to 128,902.78, 177,883.15 and 71,538.77

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Solution

The fourth proportional to 128,902.78, 177,883.15 and 71,538.77 is: 98,722.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,902.78 : 177,883.15 = 71,538.77 : x
  2. Step 2: Convert to fraction form
    128,902.78/177,883.15 = 71,538.77/x
  3. Step 3: Cross multiply
    128,902.78x = 177,883.15 × 71,538.77
  4. Step 4: Simplify right side
    128,902.78x = 12,725,540,865.31
  5. Step 5: Solve for x
    x = 12,725,540,865.31/128,902.78
  6. Step 6: Final answer
    x = 98,722.01

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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.