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Finding the Fourth Proportional to 103,390.63, 154,385.60 and 82,091.68

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Solution

The fourth proportional to 103,390.63, 154,385.60 and 82,091.68 is: 122,581.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,390.63 : 154,385.60 = 82,091.68 : x
  2. Step 2: Convert to fraction form
    103,390.63/154,385.60 = 82,091.68/x
  3. Step 3: Cross multiply
    103,390.63x = 154,385.60 × 82,091.68
  4. Step 4: Simplify right side
    103,390.63x = 12,673,772,475.39
  5. Step 5: Solve for x
    x = 12,673,772,475.39/103,390.63
  6. Step 6: Final answer
    x = 122,581.44

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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.