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Finding the Fourth Proportional to 128,653.37, 177,319.99 and 85,555.83

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Solution

The fourth proportional to 128,653.37, 177,319.99 and 85,555.83 is: 117,919.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,653.37 : 177,319.99 = 85,555.83 : x
  2. Step 2: Convert to fraction form
    128,653.37/177,319.99 = 85,555.83/x
  3. Step 3: Cross multiply
    128,653.37x = 177,319.99 × 85,555.83
  4. Step 4: Simplify right side
    128,653.37x = 15,170,758,033.44
  5. Step 5: Solve for x
    x = 15,170,758,033.44/128,653.37
  6. Step 6: Final answer
    x = 117,919.63

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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.