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Finding the Fourth Proportional to 54,289.70, 81,446.70 and 21,006.80

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Solution

The fourth proportional to 54,289.70, 81,446.70 and 21,006.80 is: 31,514.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,289.70 : 81,446.70 = 21,006.80 : x
  2. Step 2: Convert to fraction form
    54,289.70/81,446.70 = 21,006.80/x
  3. Step 3: Cross multiply
    54,289.70x = 81,446.70 × 21,006.80
  4. Step 4: Simplify right side
    54,289.70x = 1,710,934,537.56
  5. Step 5: Solve for x
    x = 1,710,934,537.56/54,289.70
  6. Step 6: Final answer
    x = 31,514.90

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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.