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Finding the Fourth Proportional to 18,678.80, 25,787.68 and 11,609.12

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Solution

The fourth proportional to 18,678.80, 25,787.68 and 11,609.12 is: 16,027.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678.80 : 25,787.68 = 11,609.12 : x
  2. Step 2: Convert to fraction form
    18,678.80/25,787.68 = 11,609.12/x
  3. Step 3: Cross multiply
    18,678.80x = 25,787.68 × 11,609.12
  4. Step 4: Simplify right side
    18,678.80x = 299,372,271.64
  5. Step 5: Solve for x
    x = 299,372,271.64/18,678.80
  6. Step 6: Final answer
    x = 16,027.38

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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.