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Finding the Fourth Proportional to 100,673.77, 138,926.86 and 55,351.71

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Solution

The fourth proportional to 100,673.77, 138,926.86 and 55,351.71 is: 76,383.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,673.77 : 138,926.86 = 55,351.71 : x
  2. Step 2: Convert to fraction form
    100,673.77/138,926.86 = 55,351.71/x
  3. Step 3: Cross multiply
    100,673.77x = 138,926.86 × 55,351.71
  4. Step 4: Simplify right side
    100,673.77x = 7,689,839,265.93
  5. Step 5: Solve for x
    x = 7,689,839,265.93/100,673.77
  6. Step 6: Final answer
    x = 76,383.74

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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.