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Finding the Fourth Proportional to 3,604.40, 5,406.55 and 1,139.40

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Solution

The fourth proportional to 3,604.40, 5,406.55 and 1,139.40 is: 1,709.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,604.40 : 5,406.55 = 1,139.40 : x
  2. Step 2: Convert to fraction form
    3,604.40/5,406.55 = 1,139.40/x
  3. Step 3: Cross multiply
    3,604.40x = 5,406.55 × 1,139.40
  4. Step 4: Simplify right side
    3,604.40x = 6,160,220.22
  5. Step 5: Solve for x
    x = 6,160,220.22/3,604.40
  6. Step 6: Final answer
    x = 1,709.08

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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.