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Finding the Fourth Proportional to 12,425.91, 18,638.87 and 8,518.47

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Solution

The fourth proportional to 12,425.91, 18,638.87 and 8,518.47 is: 12,777.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,425.91 : 18,638.87 = 8,518.47 : x
  2. Step 2: Convert to fraction form
    12,425.91/18,638.87 = 8,518.47/x
  3. Step 3: Cross multiply
    12,425.91x = 18,638.87 × 8,518.47
  4. Step 4: Simplify right side
    12,425.91x = 158,774,612.34
  5. Step 5: Solve for x
    x = 158,774,612.34/12,425.91
  6. Step 6: Final answer
    x = 12,777.71

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Similar ratio
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1.5x scale

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.