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Finding the Fourth Proportional to 20,866.92, 28,797.91 and 12,913.77

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Solution

The fourth proportional to 20,866.92, 28,797.91 and 12,913.77 is: 17,821.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,866.92 : 28,797.91 = 12,913.77 : x
  2. Step 2: Convert to fraction form
    20,866.92/28,797.91 = 12,913.77/x
  3. Step 3: Cross multiply
    20,866.92x = 28,797.91 × 12,913.77
  4. Step 4: Simplify right side
    20,866.92x = 371,889,586.22
  5. Step 5: Solve for x
    x = 371,889,586.22/20,866.92
  6. Step 6: Final answer
    x = 17,821.97

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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.