Home / 128,639.82-177,536.10-74,194.11

Finding the Fourth Proportional to 128,639.82, 177,536.10 and 74,194.11

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Solution

The fourth proportional to 128,639.82, 177,536.10 and 74,194.11 is: 102,395.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.82 : 177,536.10 = 74,194.11 : x
  2. Step 2: Convert to fraction form
    128,639.82/177,536.10 = 74,194.11/x
  3. Step 3: Cross multiply
    128,639.82x = 177,536.10 × 74,194.11
  4. Step 4: Simplify right side
    128,639.82x = 13,172,132,932.37
  5. Step 5: Solve for x
    x = 13,172,132,932.37/128,639.82
  6. Step 6: Final answer
    x = 102,395.46

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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.