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Finding the Fourth Proportional to 139,838.45, 192,970.82 and 81,700.56

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Solution

The fourth proportional to 139,838.45, 192,970.82 and 81,700.56 is: 112,743.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,838.45 : 192,970.82 = 81,700.56 : x
  2. Step 2: Convert to fraction form
    139,838.45/192,970.82 = 81,700.56/x
  3. Step 3: Cross multiply
    139,838.45x = 192,970.82 × 81,700.56
  4. Step 4: Simplify right side
    139,838.45x = 15,765,824,261.91
  5. Step 5: Solve for x
    x = 15,765,824,261.91/139,838.45
  6. Step 6: Final answer
    x = 112,743.13

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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.