Home / 1,330.12-1,996.80-1,239.40

Finding the Fourth Proportional to 1,330.12, 1,996.80 and 1,239.40

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Solution

The fourth proportional to 1,330.12, 1,996.80 and 1,239.40 is: 1,860.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.12 : 1,996.80 = 1,239.40 : x
  2. Step 2: Convert to fraction form
    1,330.12/1,996.80 = 1,239.40/x
  3. Step 3: Cross multiply
    1,330.12x = 1,996.80 × 1,239.40
  4. Step 4: Simplify right side
    1,330.12x = 2,474,833.92
  5. Step 5: Solve for x
    x = 2,474,833.92/1,330.12
  6. Step 6: Final answer
    x = 1,860.61

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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.