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Finding the Fourth Proportional to 129,597.75, 178,904.84 and 91,388.43

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Solution

The fourth proportional to 129,597.75, 178,904.84 and 91,388.43 is: 126,158.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,597.75 : 178,904.84 = 91,388.43 : x
  2. Step 2: Convert to fraction form
    129,597.75/178,904.84 = 91,388.43/x
  3. Step 3: Cross multiply
    129,597.75x = 178,904.84 × 91,388.43
  4. Step 4: Simplify right side
    129,597.75x = 16,349,831,990.06
  5. Step 5: Solve for x
    x = 16,349,831,990.06/129,597.75
  6. Step 6: Final answer
    x = 126,158.30

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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.