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Finding the Fourth Proportional to 239,912, 331,107.72 and 139,310

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Solution

The fourth proportional to 239,912, 331,107.72 and 139,310 is: 192,264.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,912 : 331,107.72 = 139,310 : x
  2. Step 2: Convert to fraction form
    239,912/331,107.72 = 139,310/x
  3. Step 3: Cross multiply
    239,912x = 331,107.72 × 139,310
  4. Step 4: Simplify right side
    239,912x = 46,126,616,473.20
  5. Step 5: Solve for x
    x = 46,126,616,473.20/239,912
  6. Step 6: Final answer
    x = 192,264.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.