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Finding the Fourth Proportional to 128,858.67, 177,824.43 and 72,270.05

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Solution

The fourth proportional to 128,858.67, 177,824.43 and 72,270.05 is: 99,732.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,858.67 : 177,824.43 = 72,270.05 : x
  2. Step 2: Convert to fraction form
    128,858.67/177,824.43 = 72,270.05/x
  3. Step 3: Cross multiply
    128,858.67x = 177,824.43 × 72,270.05
  4. Step 4: Simplify right side
    128,858.67x = 12,851,379,558.20
  5. Step 5: Solve for x
    x = 12,851,379,558.20/128,858.67
  6. Step 6: Final answer
    x = 99,732.36

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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.