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Finding the Fourth Proportional to 28,871.72, 39,831.72 and 16,930.64

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Solution

The fourth proportional to 28,871.72, 39,831.72 and 16,930.64 is: 23,357.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,871.72 : 39,831.72 = 16,930.64 : x
  2. Step 2: Convert to fraction form
    28,871.72/39,831.72 = 16,930.64/x
  3. Step 3: Cross multiply
    28,871.72x = 39,831.72 × 16,930.64
  4. Step 4: Simplify right side
    28,871.72x = 674,376,511.90
  5. Step 5: Solve for x
    x = 674,376,511.90/28,871.72
  6. Step 6: Final answer
    x = 23,357.68

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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.