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Finding the Fourth Proportional to 3,661.60, 5,488.80 and 1,811.20

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Solution

The fourth proportional to 3,661.60, 5,488.80 and 1,811.20 is: 2,715.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,661.60 : 5,488.80 = 1,811.20 : x
  2. Step 2: Convert to fraction form
    3,661.60/5,488.80 = 1,811.20/x
  3. Step 3: Cross multiply
    3,661.60x = 5,488.80 × 1,811.20
  4. Step 4: Simplify right side
    3,661.60x = 9,941,314.56
  5. Step 5: Solve for x
    x = 9,941,314.56/3,661.60
  6. Step 6: Final answer
    x = 2,715.02

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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.