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Finding the Fourth Proportional to 138,412.95, 191,009.83 and 74,750.73

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Solution

The fourth proportional to 138,412.95, 191,009.83 and 74,750.73 is: 103,155.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,412.95 : 191,009.83 = 74,750.73 : x
  2. Step 2: Convert to fraction form
    138,412.95/191,009.83 = 74,750.73/x
  3. Step 3: Cross multiply
    138,412.95x = 191,009.83 × 74,750.73
  4. Step 4: Simplify right side
    138,412.95x = 14,278,124,229.68
  5. Step 5: Solve for x
    x = 14,278,124,229.68/138,412.95
  6. Step 6: Final answer
    x = 103,155.99

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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.