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Finding the Fourth Proportional to 18,658.60, 25,744.98 and 11,580.82

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Solution

The fourth proportional to 18,658.60, 25,744.98 and 11,580.82 is: 15,979.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,658.60 : 25,744.98 = 11,580.82 : x
  2. Step 2: Convert to fraction form
    18,658.60/25,744.98 = 11,580.82/x
  3. Step 3: Cross multiply
    18,658.60x = 25,744.98 × 11,580.82
  4. Step 4: Simplify right side
    18,658.60x = 298,147,979.28
  5. Step 5: Solve for x
    x = 298,147,979.28/18,658.60
  6. Step 6: Final answer
    x = 15,979.12

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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.