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Finding the Fourth Proportional to 139,790.16, 208,671.86 and 129,383.76

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Solution

The fourth proportional to 139,790.16, 208,671.86 and 129,383.76 is: 193,137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,790.16 : 208,671.86 = 129,383.76 : x
  2. Step 2: Convert to fraction form
    139,790.16/208,671.86 = 129,383.76/x
  3. Step 3: Cross multiply
    139,790.16x = 208,671.86 × 129,383.76
  4. Step 4: Simplify right side
    139,790.16x = 26,998,749,852.99
  5. Step 5: Solve for x
    x = 26,998,749,852.99/139,790.16
  6. Step 6: Final answer
    x = 193,137.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.