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Finding the Fourth Proportional to 7,951.80, 11,916.90 and 5,311.80

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Solution

The fourth proportional to 7,951.80, 11,916.90 and 5,311.80 is: 7,960.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,951.80 : 11,916.90 = 5,311.80 : x
  2. Step 2: Convert to fraction form
    7,951.80/11,916.90 = 5,311.80/x
  3. Step 3: Cross multiply
    7,951.80x = 11,916.90 × 5,311.80
  4. Step 4: Simplify right side
    7,951.80x = 63,300,189.42
  5. Step 5: Solve for x
    x = 63,300,189.42/7,951.80
  6. Step 6: Final answer
    x = 7,960.49

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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.