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Finding the Fourth Proportional to 7,320.40, 10,980.60 and 3,425.20

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Solution

The fourth proportional to 7,320.40, 10,980.60 and 3,425.20 is: 5,137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320.40 : 10,980.60 = 3,425.20 : x
  2. Step 2: Convert to fraction form
    7,320.40/10,980.60 = 3,425.20/x
  3. Step 3: Cross multiply
    7,320.40x = 10,980.60 × 3,425.20
  4. Step 4: Simplify right side
    7,320.40x = 37,610,751.12
  5. Step 5: Solve for x
    x = 37,610,751.12/7,320.40
  6. Step 6: Final answer
    x = 5,137.80

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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.