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Finding the Fourth Proportional to 128,038.40, 192,057.60 and 105,876.80

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Solution

The fourth proportional to 128,038.40, 192,057.60 and 105,876.80 is: 158,815.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,038.40 : 192,057.60 = 105,876.80 : x
  2. Step 2: Convert to fraction form
    128,038.40/192,057.60 = 105,876.80/x
  3. Step 3: Cross multiply
    128,038.40x = 192,057.60 × 105,876.80
  4. Step 4: Simplify right side
    128,038.40x = 20,334,444,103.68
  5. Step 5: Solve for x
    x = 20,334,444,103.68/128,038.40
  6. Step 6: Final answer
    x = 158,815.20

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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.