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Finding the Fourth Proportional to 18,782.82, 28,174.25 and 7,687.59

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Solution

The fourth proportional to 18,782.82, 28,174.25 and 7,687.59 is: 11,531.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,782.82 : 28,174.25 = 7,687.59 : x
  2. Step 2: Convert to fraction form
    18,782.82/28,174.25 = 7,687.59/x
  3. Step 3: Cross multiply
    18,782.82x = 28,174.25 × 7,687.59
  4. Step 4: Simplify right side
    18,782.82x = 216,592,044.12
  5. Step 5: Solve for x
    x = 216,592,044.12/18,782.82
  6. Step 6: Final answer
    x = 11,531.39

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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.