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Finding the Fourth Proportional to 139,356.79, 192,392.16 and 91,748.53

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Solution

The fourth proportional to 139,356.79, 192,392.16 and 91,748.53 is: 126,665.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,356.79 : 192,392.16 = 91,748.53 : x
  2. Step 2: Convert to fraction form
    139,356.79/192,392.16 = 91,748.53/x
  3. Step 3: Cross multiply
    139,356.79x = 192,392.16 × 91,748.53
  4. Step 4: Simplify right side
    139,356.79x = 17,651,698,276.04
  5. Step 5: Solve for x
    x = 17,651,698,276.04/139,356.79
  6. Step 6: Final answer
    x = 126,665.51

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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.