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Finding the Fourth Proportional to 128,628.72, 177,508.44 and 72,039.96

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Solution

The fourth proportional to 128,628.72, 177,508.44 and 72,039.96 is: 99,415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.72 : 177,508.44 = 72,039.96 : x
  2. Step 2: Convert to fraction form
    128,628.72/177,508.44 = 72,039.96/x
  3. Step 3: Cross multiply
    128,628.72x = 177,508.44 × 72,039.96
  4. Step 4: Simplify right side
    128,628.72x = 12,787,700,917.26
  5. Step 5: Solve for x
    x = 12,787,700,917.26/128,628.72
  6. Step 6: Final answer
    x = 99,415.60

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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.