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Finding the Fourth Proportional to 5,490.64, 8,235.64 and 1,386.64

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Solution

The fourth proportional to 5,490.64, 8,235.64 and 1,386.64 is: 2,079.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,490.64 : 8,235.64 = 1,386.64 : x
  2. Step 2: Convert to fraction form
    5,490.64/8,235.64 = 1,386.64/x
  3. Step 3: Cross multiply
    5,490.64x = 8,235.64 × 1,386.64
  4. Step 4: Simplify right side
    5,490.64x = 11,419,867.85
  5. Step 5: Solve for x
    x = 11,419,867.85/5,490.64
  6. Step 6: Final answer
    x = 2,079.88

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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.