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Finding the Fourth Proportional to 139,802.64, 192,929.85 and 76,140.39

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Solution

The fourth proportional to 139,802.64, 192,929.85 and 76,140.39 is: 105,074.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,802.64 : 192,929.85 = 76,140.39 : x
  2. Step 2: Convert to fraction form
    139,802.64/192,929.85 = 76,140.39/x
  3. Step 3: Cross multiply
    139,802.64x = 192,929.85 × 76,140.39
  4. Step 4: Simplify right side
    139,802.64x = 14,689,753,640.94
  5. Step 5: Solve for x
    x = 14,689,753,640.94/139,802.64
  6. Step 6: Final answer
    x = 105,074.94

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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.