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Finding the Fourth Proportional to 138,998.50, 191,816.85 and 75,334.66

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Solution

The fourth proportional to 138,998.50, 191,816.85 and 75,334.66 is: 103,961.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,998.50 : 191,816.85 = 75,334.66 : x
  2. Step 2: Convert to fraction form
    138,998.50/191,816.85 = 75,334.66/x
  3. Step 3: Cross multiply
    138,998.50x = 191,816.85 × 75,334.66
  4. Step 4: Simplify right side
    138,998.50x = 14,450,457,177.02
  5. Step 5: Solve for x
    x = 14,450,457,177.02/138,998.50
  6. Step 6: Final answer
    x = 103,961.25

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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.