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Finding the Fourth Proportional to 128,382.67, 177,152.47 and 71,014.32

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Solution

The fourth proportional to 128,382.67, 177,152.47 and 71,014.32 is: 97,991.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,382.67 : 177,152.47 = 71,014.32 : x
  2. Step 2: Convert to fraction form
    128,382.67/177,152.47 = 71,014.32/x
  3. Step 3: Cross multiply
    128,382.67x = 177,152.47 × 71,014.32
  4. Step 4: Simplify right side
    128,382.67x = 12,580,362,015.83
  5. Step 5: Solve for x
    x = 12,580,362,015.83/128,382.67
  6. Step 6: Final answer
    x = 97,991.12

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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.