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Finding the Fourth Proportional to 107,911.80, 161,721.90 and 72,271.80

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Solution

The fourth proportional to 107,911.80, 161,721.90 and 72,271.80 is: 108,310.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,911.80 : 161,721.90 = 72,271.80 : x
  2. Step 2: Convert to fraction form
    107,911.80/161,721.90 = 72,271.80/x
  3. Step 3: Cross multiply
    107,911.80x = 161,721.90 × 72,271.80
  4. Step 4: Simplify right side
    107,911.80x = 11,687,932,812.42
  5. Step 5: Solve for x
    x = 11,687,932,812.42/107,911.80
  6. Step 6: Final answer
    x = 108,310.05

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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.