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Finding the Fourth Proportional to 138,700.75, 191,408.42 and 75,039.92

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Solution

The fourth proportional to 138,700.75, 191,408.42 and 75,039.92 is: 103,555.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,700.75 : 191,408.42 = 75,039.92 : x
  2. Step 2: Convert to fraction form
    138,700.75/191,408.42 = 75,039.92/x
  3. Step 3: Cross multiply
    138,700.75x = 191,408.42 × 75,039.92
  4. Step 4: Simplify right side
    138,700.75x = 14,363,272,524.13
  5. Step 5: Solve for x
    x = 14,363,272,524.13/138,700.75
  6. Step 6: Final answer
    x = 103,555.84

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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.