Home / 128,562.19-177,415.85-71,974.78

Finding the Fourth Proportional to 128,562.19, 177,415.85 and 71,974.78

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Solution

The fourth proportional to 128,562.19, 177,415.85 and 71,974.78 is: 99,325.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,562.19 : 177,415.85 = 71,974.78 : x
  2. Step 2: Convert to fraction form
    128,562.19/177,415.85 = 71,974.78/x
  3. Step 3: Cross multiply
    128,562.19x = 177,415.85 × 71,974.78
  4. Step 4: Simplify right side
    128,562.19x = 12,769,466,508.66
  5. Step 5: Solve for x
    x = 12,769,466,508.66/128,562.19
  6. Step 6: Final answer
    x = 99,325.21

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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.