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Finding the Fourth Proportional to 18,813.10, 25,961.70 and 10,855.12

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Solution

The fourth proportional to 18,813.10, 25,961.70 and 10,855.12 is: 14,979.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.10 : 25,961.70 = 10,855.12 : x
  2. Step 2: Convert to fraction form
    18,813.10/25,961.70 = 10,855.12/x
  3. Step 3: Cross multiply
    18,813.10x = 25,961.70 × 10,855.12
  4. Step 4: Simplify right side
    18,813.10x = 281,817,368.90
  5. Step 5: Solve for x
    x = 281,817,368.90/18,813.10
  6. Step 6: Final answer
    x = 14,979.85

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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.