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Finding the Fourth Proportional to 128,107.79, 192,278.31 and 68,186.58

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Solution

The fourth proportional to 128,107.79, 192,278.31 and 68,186.58 is: 102,341.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,107.79 : 192,278.31 = 68,186.58 : x
  2. Step 2: Convert to fraction form
    128,107.79/192,278.31 = 68,186.58/x
  3. Step 3: Cross multiply
    128,107.79x = 192,278.31 × 68,186.58
  4. Step 4: Simplify right side
    128,107.79x = 13,110,799,390.34
  5. Step 5: Solve for x
    x = 13,110,799,390.34/128,107.79
  6. Step 6: Final answer
    x = 102,341.93

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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.