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Finding the Fourth Proportional to 18,409.91, 25,421.92 and 13,685.99

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Solution

The fourth proportional to 18,409.91, 25,421.92 and 13,685.99 is: 18,898.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,409.91 : 25,421.92 = 13,685.99 : x
  2. Step 2: Convert to fraction form
    18,409.91/25,421.92 = 13,685.99/x
  3. Step 3: Cross multiply
    18,409.91x = 25,421.92 × 13,685.99
  4. Step 4: Simplify right side
    18,409.91x = 347,923,981.58
  5. Step 5: Solve for x
    x = 347,923,981.58/18,409.91
  6. Step 6: Final answer
    x = 18,898.74

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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.