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Finding the Fourth Proportional to 20,558.61, 28,367.08 and 12,490.61

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Solution

The fourth proportional to 20,558.61, 28,367.08 and 12,490.61 is: 17,234.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,558.61 : 28,367.08 = 12,490.61 : x
  2. Step 2: Convert to fraction form
    20,558.61/28,367.08 = 12,490.61/x
  3. Step 3: Cross multiply
    20,558.61x = 28,367.08 × 12,490.61
  4. Step 4: Simplify right side
    20,558.61x = 354,321,960.06
  5. Step 5: Solve for x
    x = 354,321,960.06/20,558.61
  6. Step 6: Final answer
    x = 17,234.72

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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.