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Finding the Fourth Proportional to 139,838.85, 192,976.65 and 76,176.68

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Solution

The fourth proportional to 139,838.85, 192,976.65 and 76,176.68 is: 105,123.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,838.85 : 192,976.65 = 76,176.68 : x
  2. Step 2: Convert to fraction form
    139,838.85/192,976.65 = 76,176.68/x
  3. Step 3: Cross multiply
    139,838.85x = 192,976.65 × 76,176.68
  4. Step 4: Simplify right side
    139,838.85x = 14,700,319,549.64
  5. Step 5: Solve for x
    x = 14,700,319,549.64/139,838.85
  6. Step 6: Final answer
    x = 105,123.29

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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.