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Finding the Fourth Proportional to 138,451.94, 191,063.84 and 74,789.73

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Solution

The fourth proportional to 138,451.94, 191,063.84 and 74,789.73 is: 103,209.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,451.94 : 191,063.84 = 74,789.73 : x
  2. Step 2: Convert to fraction form
    138,451.94/191,063.84 = 74,789.73/x
  3. Step 3: Cross multiply
    138,451.94x = 191,063.84 × 74,789.73
  4. Step 4: Simplify right side
    138,451.94x = 14,289,613,909.83
  5. Step 5: Solve for x
    x = 14,289,613,909.83/138,451.94
  6. Step 6: Final answer
    x = 103,209.92

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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.