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Finding the Fourth Proportional to 54,308.90, 81,424.74 and 21,000.90

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Solution

The fourth proportional to 54,308.90, 81,424.74 and 21,000.90 is: 31,486.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,308.90 : 81,424.74 = 21,000.90 : x
  2. Step 2: Convert to fraction form
    54,308.90/81,424.74 = 21,000.90/x
  3. Step 3: Cross multiply
    54,308.90x = 81,424.74 × 21,000.90
  4. Step 4: Simplify right side
    54,308.90x = 1,709,992,822.27
  5. Step 5: Solve for x
    x = 1,709,992,822.27/54,308.90
  6. Step 6: Final answer
    x = 31,486.42

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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.