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Finding the Fourth Proportional to 128,078.56, 176,755.26 and 74,380.42

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Solution

The fourth proportional to 128,078.56, 176,755.26 and 74,380.42 is: 102,648.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,078.56 : 176,755.26 = 74,380.42 : x
  2. Step 2: Convert to fraction form
    128,078.56/176,755.26 = 74,380.42/x
  3. Step 3: Cross multiply
    128,078.56x = 176,755.26 × 74,380.42
  4. Step 4: Simplify right side
    128,078.56x = 13,147,130,476.01
  5. Step 5: Solve for x
    x = 13,147,130,476.01/128,078.56
  6. Step 6: Final answer
    x = 102,648.96

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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.