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Finding the Fourth Proportional to 128,460.12, 192,719.46 and 69,294.48

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Solution

The fourth proportional to 128,460.12, 192,719.46 and 69,294.48 is: 103,957.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,460.12 : 192,719.46 = 69,294.48 : x
  2. Step 2: Convert to fraction form
    128,460.12/192,719.46 = 69,294.48/x
  3. Step 3: Cross multiply
    128,460.12x = 192,719.46 × 69,294.48
  4. Step 4: Simplify right side
    128,460.12x = 13,354,394,766.58
  5. Step 5: Solve for x
    x = 13,354,394,766.58/128,460.12
  6. Step 6: Final answer
    x = 103,957.51

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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.