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Finding the Fourth Proportional to 11,211.80, 16,817.70 and 7,931.30

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Solution

The fourth proportional to 11,211.80, 16,817.70 and 7,931.30 is: 11,896.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,211.80 : 16,817.70 = 7,931.30 : x
  2. Step 2: Convert to fraction form
    11,211.80/16,817.70 = 7,931.30/x
  3. Step 3: Cross multiply
    11,211.80x = 16,817.70 × 7,931.30
  4. Step 4: Simplify right side
    11,211.80x = 133,386,224.01
  5. Step 5: Solve for x
    x = 133,386,224.01/11,211.80
  6. Step 6: Final answer
    x = 11,896.95

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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.