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Finding the Fourth Proportional to 139,792.90, 192,907.34 and 79,355.46

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Solution

The fourth proportional to 139,792.90, 192,907.34 and 79,355.46 is: 109,506.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,792.90 : 192,907.34 = 79,355.46 : x
  2. Step 2: Convert to fraction form
    139,792.90/192,907.34 = 79,355.46/x
  3. Step 3: Cross multiply
    139,792.90x = 192,907.34 × 79,355.46
  4. Step 4: Simplify right side
    139,792.90x = 15,308,250,703.08
  5. Step 5: Solve for x
    x = 15,308,250,703.08/139,792.90
  6. Step 6: Final answer
    x = 109,506.64

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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.