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Finding the Fourth Proportional to 27,890.78, 38,491.94 and 15,951.78

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Solution

The fourth proportional to 27,890.78, 38,491.94 and 15,951.78 is: 22,014.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,890.78 : 38,491.94 = 15,951.78 : x
  2. Step 2: Convert to fraction form
    27,890.78/38,491.94 = 15,951.78/x
  3. Step 3: Cross multiply
    27,890.78x = 38,491.94 × 15,951.78
  4. Step 4: Simplify right side
    27,890.78x = 614,014,998.53
  5. Step 5: Solve for x
    x = 614,014,998.53/27,890.78
  6. Step 6: Final answer
    x = 22,014.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.