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Finding the Fourth Proportional to 128,671.22, 177,633.50 and 99,926.40

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Solution

The fourth proportional to 128,671.22, 177,633.50 and 99,926.40 is: 137,950.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,671.22 : 177,633.50 = 99,926.40 : x
  2. Step 2: Convert to fraction form
    128,671.22/177,633.50 = 99,926.40/x
  3. Step 3: Cross multiply
    128,671.22x = 177,633.50 × 99,926.40
  4. Step 4: Simplify right side
    128,671.22x = 17,750,276,174.40
  5. Step 5: Solve for x
    x = 17,750,276,174.40/128,671.22
  6. Step 6: Final answer
    x = 137,950.63

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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.