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Finding the Fourth Proportional to 128,611.83, 177,469.70 and 74,885.52

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Solution

The fourth proportional to 128,611.83, 177,469.70 and 74,885.52 is: 103,333.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.83 : 177,469.70 = 74,885.52 : x
  2. Step 2: Convert to fraction form
    128,611.83/177,469.70 = 74,885.52/x
  3. Step 3: Cross multiply
    128,611.83x = 177,469.70 × 74,885.52
  4. Step 4: Simplify right side
    128,611.83x = 13,289,910,394.32
  5. Step 5: Solve for x
    x = 13,289,910,394.32/128,611.83
  6. Step 6: Final answer
    x = 103,333.50

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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.