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Finding the Fourth Proportional to 170,645.88, 255,769.50 and 128,390.20

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Solution

The fourth proportional to 170,645.88, 255,769.50 and 128,390.20 is: 192,435.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,645.88 : 255,769.50 = 128,390.20 : x
  2. Step 2: Convert to fraction form
    170,645.88/255,769.50 = 128,390.20/x
  3. Step 3: Cross multiply
    170,645.88x = 255,769.50 × 128,390.20
  4. Step 4: Simplify right side
    170,645.88x = 32,838,297,258.90
  5. Step 5: Solve for x
    x = 32,838,297,258.90/170,645.88
  6. Step 6: Final answer
    x = 192,435.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.