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Finding the Fourth Proportional to 139,330.71, 192,356.08 and 91,722.45

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Solution

The fourth proportional to 139,330.71, 192,356.08 and 91,722.45 is: 126,629.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,330.71 : 192,356.08 = 91,722.45 : x
  2. Step 2: Convert to fraction form
    139,330.71/192,356.08 = 91,722.45/x
  3. Step 3: Cross multiply
    139,330.71x = 192,356.08 × 91,722.45
  4. Step 4: Simplify right side
    139,330.71x = 17,643,371,937.96
  5. Step 5: Solve for x
    x = 17,643,371,937.96/139,330.71
  6. Step 6: Final answer
    x = 126,629.46

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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.