Home / 128,557.14-177,387.72-80,776.64

Finding the Fourth Proportional to 128,557.14, 177,387.72 and 80,776.64

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Solution

The fourth proportional to 128,557.14, 177,387.72 and 80,776.64 is: 111,458.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,557.14 : 177,387.72 = 80,776.64 : x
  2. Step 2: Convert to fraction form
    128,557.14/177,387.72 = 80,776.64/x
  3. Step 3: Cross multiply
    128,557.14x = 177,387.72 × 80,776.64
  4. Step 4: Simplify right side
    128,557.14x = 14,328,783,998.86
  5. Step 5: Solve for x
    x = 14,328,783,998.86/128,557.14
  6. Step 6: Final answer
    x = 111,458.48

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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.