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Finding the Fourth Proportional to 7,378.80, 11,073.60 and 4,912.80

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Solution

The fourth proportional to 7,378.80, 11,073.60 and 4,912.80 is: 7,372.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,378.80 : 11,073.60 = 4,912.80 : x
  2. Step 2: Convert to fraction form
    7,378.80/11,073.60 = 4,912.80/x
  3. Step 3: Cross multiply
    7,378.80x = 11,073.60 × 4,912.80
  4. Step 4: Simplify right side
    7,378.80x = 54,402,382.08
  5. Step 5: Solve for x
    x = 54,402,382.08/7,378.80
  6. Step 6: Final answer
    x = 7,372.80

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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.