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Finding the Fourth Proportional to 138,164.95, 207,334.64 and 79,115.95

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Solution

The fourth proportional to 138,164.95, 207,334.64 and 79,115.95 is: 118,723.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,164.95 : 207,334.64 = 79,115.95 : x
  2. Step 2: Convert to fraction form
    138,164.95/207,334.64 = 79,115.95/x
  3. Step 3: Cross multiply
    138,164.95x = 207,334.64 × 79,115.95
  4. Step 4: Simplify right side
    138,164.95x = 16,403,477,011.51
  5. Step 5: Solve for x
    x = 16,403,477,011.51/138,164.95
  6. Step 6: Final answer
    x = 118,723.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.