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Finding the Fourth Proportional to 138,841.97, 191,601.59 and 78,409.67

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Solution

The fourth proportional to 138,841.97, 191,601.59 and 78,409.67 is: 108,205.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,841.97 : 191,601.59 = 78,409.67 : x
  2. Step 2: Convert to fraction form
    138,841.97/191,601.59 = 78,409.67/x
  3. Step 3: Cross multiply
    138,841.97x = 191,601.59 × 78,409.67
  4. Step 4: Simplify right side
    138,841.97x = 15,023,416,093.32
  5. Step 5: Solve for x
    x = 15,023,416,093.32/138,841.97
  6. Step 6: Final answer
    x = 108,205.15

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1.5x scale

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.