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Finding the Fourth Proportional to 247,872.20, 371,808.30 and 81,638.60

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Solution

The fourth proportional to 247,872.20, 371,808.30 and 81,638.60 is: 122,457.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    247,872.20 : 371,808.30 = 81,638.60 : x
  2. Step 2: Convert to fraction form
    247,872.20/371,808.30 = 81,638.60/x
  3. Step 3: Cross multiply
    247,872.20x = 371,808.30 × 81,638.60
  4. Step 4: Simplify right side
    247,872.20x = 30,353,909,080.38
  5. Step 5: Solve for x
    x = 30,353,909,080.38/247,872.20
  6. Step 6: Final answer
    x = 122,457.90

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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.