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Finding the Fourth Proportional to 128,705.76, 177,508.64 and 90,591.48

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Solution

The fourth proportional to 128,705.76, 177,508.64 and 90,591.48 is: 124,942.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,705.76 : 177,508.64 = 90,591.48 : x
  2. Step 2: Convert to fraction form
    128,705.76/177,508.64 = 90,591.48/x
  3. Step 3: Cross multiply
    128,705.76x = 177,508.64 × 90,591.48
  4. Step 4: Simplify right side
    128,705.76x = 16,080,770,410.39
  5. Step 5: Solve for x
    x = 16,080,770,410.39/128,705.76
  6. Step 6: Final answer
    x = 124,942.12

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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.