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Finding the Fourth Proportional to 128,785.55, 177,790.82 and 100,040.81

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Solution

The fourth proportional to 128,785.55, 177,790.82 and 100,040.81 is: 138,108.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,785.55 : 177,790.82 = 100,040.81 : x
  2. Step 2: Convert to fraction form
    128,785.55/177,790.82 = 100,040.81/x
  3. Step 3: Cross multiply
    128,785.55x = 177,790.82 × 100,040.81
  4. Step 4: Simplify right side
    128,785.55x = 17,786,336,254.21
  5. Step 5: Solve for x
    x = 17,786,336,254.21/128,785.55
  6. Step 6: Final answer
    x = 138,108.17

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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.