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Finding the Fourth Proportional to 18,254.40, 27,338.40 and 12,379.20

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Solution

The fourth proportional to 18,254.40, 27,338.40 and 12,379.20 is: 18,539.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,254.40 : 27,338.40 = 12,379.20 : x
  2. Step 2: Convert to fraction form
    18,254.40/27,338.40 = 12,379.20/x
  3. Step 3: Cross multiply
    18,254.40x = 27,338.40 × 12,379.20
  4. Step 4: Simplify right side
    18,254.40x = 338,427,521.28
  5. Step 5: Solve for x
    x = 338,427,521.28/18,254.40
  6. Step 6: Final answer
    x = 18,539.50

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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.