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Finding the Fourth Proportional to 139,139.76, 192,012.93 and 78,709.11

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Solution

The fourth proportional to 139,139.76, 192,012.93 and 78,709.11 is: 108,618.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,139.76 : 192,012.93 = 78,709.11 : x
  2. Step 2: Convert to fraction form
    139,139.76/192,012.93 = 78,709.11/x
  3. Step 3: Cross multiply
    139,139.76x = 192,012.93 × 78,709.11
  4. Step 4: Simplify right side
    139,139.76x = 15,113,166,828.79
  5. Step 5: Solve for x
    x = 15,113,166,828.79/139,139.76
  6. Step 6: Final answer
    x = 108,618.61

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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.