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Finding the Fourth Proportional to 18,791.76, 25,925.46 and 12,421.38

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Solution

The fourth proportional to 18,791.76, 25,925.46 and 12,421.38 is: 17,136.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.76 : 25,925.46 = 12,421.38 : x
  2. Step 2: Convert to fraction form
    18,791.76/25,925.46 = 12,421.38/x
  3. Step 3: Cross multiply
    18,791.76x = 25,925.46 × 12,421.38
  4. Step 4: Simplify right side
    18,791.76x = 322,029,990.33
  5. Step 5: Solve for x
    x = 322,029,990.33/18,791.76
  6. Step 6: Final answer
    x = 17,136.77

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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.