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Finding the Fourth Proportional to 128,479.28, 192,648.12 and 39,708.32

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Solution

The fourth proportional to 128,479.28, 192,648.12 and 39,708.32 is: 59,540.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,479.28 : 192,648.12 = 39,708.32 : x
  2. Step 2: Convert to fraction form
    128,479.28/192,648.12 = 39,708.32/x
  3. Step 3: Cross multiply
    128,479.28x = 192,648.12 × 39,708.32
  4. Step 4: Simplify right side
    128,479.28x = 7,649,733,196.36
  5. Step 5: Solve for x
    x = 7,649,733,196.36/128,479.28
  6. Step 6: Final answer
    x = 59,540.60

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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.