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Finding the Fourth Proportional to 11,838.80, 17,758.20 and 6,905.90

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Solution

The fourth proportional to 11,838.80, 17,758.20 and 6,905.90 is: 10,358.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,838.80 : 17,758.20 = 6,905.90 : x
  2. Step 2: Convert to fraction form
    11,838.80/17,758.20 = 6,905.90/x
  3. Step 3: Cross multiply
    11,838.80x = 17,758.20 × 6,905.90
  4. Step 4: Simplify right side
    11,838.80x = 122,636,353.38
  5. Step 5: Solve for x
    x = 122,636,353.38/11,838.80
  6. Step 6: Final answer
    x = 10,358.85

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1.5x scale

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.