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Finding the Fourth Proportional to 100,958.72, 139,329.12 and 55,636.58

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Solution

The fourth proportional to 100,958.72, 139,329.12 and 55,636.58 is: 76,781.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,958.72 : 139,329.12 = 55,636.58 : x
  2. Step 2: Convert to fraction form
    100,958.72/139,329.12 = 55,636.58/x
  3. Step 3: Cross multiply
    100,958.72x = 139,329.12 × 55,636.58
  4. Step 4: Simplify right side
    100,958.72x = 7,751,795,731.21
  5. Step 5: Solve for x
    x = 7,751,795,731.21/100,958.72
  6. Step 6: Final answer
    x = 76,781.83

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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.