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Finding the Fourth Proportional to 128,034.40, 192,051.60 and 81,493.60

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Solution

The fourth proportional to 128,034.40, 192,051.60 and 81,493.60 is: 122,240.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,034.40 : 192,051.60 = 81,493.60 : x
  2. Step 2: Convert to fraction form
    128,034.40/192,051.60 = 81,493.60/x
  3. Step 3: Cross multiply
    128,034.40x = 192,051.60 × 81,493.60
  4. Step 4: Simplify right side
    128,034.40x = 15,650,976,269.76
  5. Step 5: Solve for x
    x = 15,650,976,269.76/128,034.40
  6. Step 6: Final answer
    x = 122,240.40

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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.