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Finding the Fourth Proportional to 220,918.40, 331,432.80 and 71,172.80

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Solution

The fourth proportional to 220,918.40, 331,432.80 and 71,172.80 is: 106,776.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,918.40 : 331,432.80 = 71,172.80 : x
  2. Step 2: Convert to fraction form
    220,918.40/331,432.80 = 71,172.80/x
  3. Step 3: Cross multiply
    220,918.40x = 331,432.80 × 71,172.80
  4. Step 4: Simplify right side
    220,918.40x = 23,589,000,387.84
  5. Step 5: Solve for x
    x = 23,589,000,387.84/220,918.40
  6. Step 6: Final answer
    x = 106,776.98

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1.5x scale

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.