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Finding the Fourth Proportional to 7,279.20, 10,918.80 and 6,328.80

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Solution

The fourth proportional to 7,279.20, 10,918.80 and 6,328.80 is: 9,493.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.20 : 10,918.80 = 6,328.80 : x
  2. Step 2: Convert to fraction form
    7,279.20/10,918.80 = 6,328.80/x
  3. Step 3: Cross multiply
    7,279.20x = 10,918.80 × 6,328.80
  4. Step 4: Simplify right side
    7,279.20x = 69,102,901.44
  5. Step 5: Solve for x
    x = 69,102,901.44/7,279.20
  6. Step 6: Final answer
    x = 9,493.20

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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.