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Finding the Fourth Proportional to 1,604.40, 2,399.40 and 1,345.20

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Solution

The fourth proportional to 1,604.40, 2,399.40 and 1,345.20 is: 2,011.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,604.40 : 2,399.40 = 1,345.20 : x
  2. Step 2: Convert to fraction form
    1,604.40/2,399.40 = 1,345.20/x
  3. Step 3: Cross multiply
    1,604.40x = 2,399.40 × 1,345.20
  4. Step 4: Simplify right side
    1,604.40x = 3,227,672.88
  5. Step 5: Solve for x
    x = 3,227,672.88/1,604.40
  6. Step 6: Final answer
    x = 2,011.76

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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.