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Finding the Fourth Proportional to 7,228.80, 9,979.20 and 5,241.60

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Solution

The fourth proportional to 7,228.80, 9,979.20 and 5,241.60 is: 7,235.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,228.80 : 9,979.20 = 5,241.60 : x
  2. Step 2: Convert to fraction form
    7,228.80/9,979.20 = 5,241.60/x
  3. Step 3: Cross multiply
    7,228.80x = 9,979.20 × 5,241.60
  4. Step 4: Simplify right side
    7,228.80x = 52,306,974.72
  5. Step 5: Solve for x
    x = 52,306,974.72/7,228.80
  6. Step 6: Final answer
    x = 7,235.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.