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Finding the Fourth Proportional to 128,825, 177,718.02 and 91,120.04

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Solution

The fourth proportional to 128,825, 177,718.02 and 91,120.04 is: 125,702.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,825 : 177,718.02 = 91,120.04 : x
  2. Step 2: Convert to fraction form
    128,825/177,718.02 = 91,120.04/x
  3. Step 3: Cross multiply
    128,825x = 177,718.02 × 91,120.04
  4. Step 4: Simplify right side
    128,825x = 16,193,673,091.12
  5. Step 5: Solve for x
    x = 16,193,673,091.12/128,825
  6. Step 6: Final answer
    x = 125,702.88

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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.