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Finding the Fourth Proportional to 231,381.20, 347,071.80 and 126,405.20

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Solution

The fourth proportional to 231,381.20, 347,071.80 and 126,405.20 is: 189,607.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,381.20 : 347,071.80 = 126,405.20 : x
  2. Step 2: Convert to fraction form
    231,381.20/347,071.80 = 126,405.20/x
  3. Step 3: Cross multiply
    231,381.20x = 347,071.80 × 126,405.20
  4. Step 4: Simplify right side
    231,381.20x = 43,871,680,293.36
  5. Step 5: Solve for x
    x = 43,871,680,293.36/231,381.20
  6. Step 6: Final answer
    x = 189,607.80

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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.