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Finding the Fourth Proportional to 3,686.80, 5,530.80 and 1,378.48

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Solution

The fourth proportional to 3,686.80, 5,530.80 and 1,378.48 is: 2,067.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,686.80 : 5,530.80 = 1,378.48 : x
  2. Step 2: Convert to fraction form
    3,686.80/5,530.80 = 1,378.48/x
  3. Step 3: Cross multiply
    3,686.80x = 5,530.80 × 1,378.48
  4. Step 4: Simplify right side
    3,686.80x = 7,624,097.18
  5. Step 5: Solve for x
    x = 7,624,097.18/3,686.80
  6. Step 6: Final answer
    x = 2,067.94

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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.