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Finding the Fourth Proportional to 54,607.40, 81,911.10 and 21,328.55

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Solution

The fourth proportional to 54,607.40, 81,911.10 and 21,328.55 is: 31,992.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,607.40 : 81,911.10 = 21,328.55 : x
  2. Step 2: Convert to fraction form
    54,607.40/81,911.10 = 21,328.55/x
  3. Step 3: Cross multiply
    54,607.40x = 81,911.10 × 21,328.55
  4. Step 4: Simplify right side
    54,607.40x = 1,747,044,991.91
  5. Step 5: Solve for x
    x = 1,747,044,991.91/54,607.40
  6. Step 6: Final answer
    x = 31,992.83

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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.