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Finding the Fourth Proportional to 139,681.97, 192,801.81 and 91,290.95

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Solution

The fourth proportional to 139,681.97, 192,801.81 and 91,290.95 is: 126,008.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,681.97 : 192,801.81 = 91,290.95 : x
  2. Step 2: Convert to fraction form
    139,681.97/192,801.81 = 91,290.95/x
  3. Step 3: Cross multiply
    139,681.97x = 192,801.81 × 91,290.95
  4. Step 4: Simplify right side
    139,681.97x = 17,601,060,396.62
  5. Step 5: Solve for x
    x = 17,601,060,396.62/139,681.97
  6. Step 6: Final answer
    x = 126,008.11

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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.