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Finding the Fourth Proportional to 5,215.20, 7,822.79 and 2,095.20

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Solution

The fourth proportional to 5,215.20, 7,822.79 and 2,095.20 is: 3,142.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215.20 : 7,822.79 = 2,095.20 : x
  2. Step 2: Convert to fraction form
    5,215.20/7,822.79 = 2,095.20/x
  3. Step 3: Cross multiply
    5,215.20x = 7,822.79 × 2,095.20
  4. Step 4: Simplify right side
    5,215.20x = 16,390,304.37
  5. Step 5: Solve for x
    x = 16,390,304.37/5,215.20
  6. Step 6: Final answer
    x = 3,142.80

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Similar ratio
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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.