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Finding the Fourth Proportional to 7,381.80, 11,078.10 and 4,915.80

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Solution

The fourth proportional to 7,381.80, 11,078.10 and 4,915.80 is: 7,377.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,381.80 : 11,078.10 = 4,915.80 : x
  2. Step 2: Convert to fraction form
    7,381.80/11,078.10 = 4,915.80/x
  3. Step 3: Cross multiply
    7,381.80x = 11,078.10 × 4,915.80
  4. Step 4: Simplify right side
    7,381.80x = 54,457,723.98
  5. Step 5: Solve for x
    x = 54,457,723.98/7,381.80
  6. Step 6: Final answer
    x = 7,377.30

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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.