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Finding the Fourth Proportional to 18,521.80, 27,758.40 and 7,419.40

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Solution

The fourth proportional to 18,521.80, 27,758.40 and 7,419.40 is: 11,119.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,521.80 : 27,758.40 = 7,419.40 : x
  2. Step 2: Convert to fraction form
    18,521.80/27,758.40 = 7,419.40/x
  3. Step 3: Cross multiply
    18,521.80x = 27,758.40 × 7,419.40
  4. Step 4: Simplify right side
    18,521.80x = 205,950,672.96
  5. Step 5: Solve for x
    x = 205,950,672.96/18,521.80
  6. Step 6: Final answer
    x = 11,119.37

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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.