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Finding the Fourth Proportional to 16,811.80, 25,225.80 and 11,870.80

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Solution

The fourth proportional to 16,811.80, 25,225.80 and 11,870.80 is: 17,811.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,811.80 : 25,225.80 = 11,870.80 : x
  2. Step 2: Convert to fraction form
    16,811.80/25,225.80 = 11,870.80/x
  3. Step 3: Cross multiply
    16,811.80x = 25,225.80 × 11,870.80
  4. Step 4: Simplify right side
    16,811.80x = 299,450,426.64
  5. Step 5: Solve for x
    x = 299,450,426.64/16,811.80
  6. Step 6: Final answer
    x = 17,811.92

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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.