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Finding the Fourth Proportional to 139,306.50, 192,242.97 and 79,690.50

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Solution

The fourth proportional to 139,306.50, 192,242.97 and 79,690.50 is: 109,972.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,306.50 : 192,242.97 = 79,690.50 : x
  2. Step 2: Convert to fraction form
    139,306.50/192,242.97 = 79,690.50/x
  3. Step 3: Cross multiply
    139,306.50x = 192,242.97 × 79,690.50
  4. Step 4: Simplify right side
    139,306.50x = 15,319,938,400.79
  5. Step 5: Solve for x
    x = 15,319,938,400.79/139,306.50
  6. Step 6: Final answer
    x = 109,972.89

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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.