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Finding the Fourth Proportional to 18,516.40, 27,773.96 and 7,420.10

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Solution

The fourth proportional to 18,516.40, 27,773.96 and 7,420.10 is: 11,129.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,516.40 : 27,773.96 = 7,420.10 : x
  2. Step 2: Convert to fraction form
    18,516.40/27,773.96 = 7,420.10/x
  3. Step 3: Cross multiply
    18,516.40x = 27,773.96 × 7,420.10
  4. Step 4: Simplify right side
    18,516.40x = 206,085,648.58
  5. Step 5: Solve for x
    x = 206,085,648.58/18,516.40
  6. Step 6: Final answer
    x = 11,129.90

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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.