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Finding the Fourth Proportional to 21,239.72, 31,859.76 and 7,379

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Solution

The fourth proportional to 21,239.72, 31,859.76 and 7,379 is: 11,068.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,239.72 : 31,859.76 = 7,379 : x
  2. Step 2: Convert to fraction form
    21,239.72/31,859.76 = 7,379/x
  3. Step 3: Cross multiply
    21,239.72x = 31,859.76 × 7,379
  4. Step 4: Simplify right side
    21,239.72x = 235,093,169.04
  5. Step 5: Solve for x
    x = 235,093,169.04/21,239.72
  6. Step 6: Final answer
    x = 11,068.56

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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.