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Finding the Fourth Proportional to 18,420.86, 25,429.87 and 12,759.92

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Solution

The fourth proportional to 18,420.86, 25,429.87 and 12,759.92 is: 17,614.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.86 : 25,429.87 = 12,759.92 : x
  2. Step 2: Convert to fraction form
    18,420.86/25,429.87 = 12,759.92/x
  3. Step 3: Cross multiply
    18,420.86x = 25,429.87 × 12,759.92
  4. Step 4: Simplify right side
    18,420.86x = 324,483,106.81
  5. Step 5: Solve for x
    x = 324,483,106.81/18,420.86
  6. Step 6: Final answer
    x = 17,614.98

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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.