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Finding the Fourth Proportional to 128,851.20, 193,276.80 and 34,081.20

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Solution

The fourth proportional to 128,851.20, 193,276.80 and 34,081.20 is: 51,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,851.20 : 193,276.80 = 34,081.20 : x
  2. Step 2: Convert to fraction form
    128,851.20/193,276.80 = 34,081.20/x
  3. Step 3: Cross multiply
    128,851.20x = 193,276.80 × 34,081.20
  4. Step 4: Simplify right side
    128,851.20x = 6,587,105,276.16
  5. Step 5: Solve for x
    x = 6,587,105,276.16/128,851.20
  6. Step 6: Final answer
    x = 51,121.80

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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.