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Finding the Fourth Proportional to 12,085.80, 18,099.90 and 7,420.20

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Solution

The fourth proportional to 12,085.80, 18,099.90 and 7,420.20 is: 11,112.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,085.80 : 18,099.90 = 7,420.20 : x
  2. Step 2: Convert to fraction form
    12,085.80/18,099.90 = 7,420.20/x
  3. Step 3: Cross multiply
    12,085.80x = 18,099.90 × 7,420.20
  4. Step 4: Simplify right side
    12,085.80x = 134,304,877.98
  5. Step 5: Solve for x
    x = 134,304,877.98/12,085.80
  6. Step 6: Final answer
    x = 11,112.62

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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.