Home / 1,972.65-2,961.90-1,318.61

Finding the Fourth Proportional to 1,972.65, 2,961.90 and 1,318.61

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Solution

The fourth proportional to 1,972.65, 2,961.90 and 1,318.61 is: 1,979.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,972.65 : 2,961.90 = 1,318.61 : x
  2. Step 2: Convert to fraction form
    1,972.65/2,961.90 = 1,318.61/x
  3. Step 3: Cross multiply
    1,972.65x = 2,961.90 × 1,318.61
  4. Step 4: Simplify right side
    1,972.65x = 3,905,598.36
  5. Step 5: Solve for x
    x = 3,905,598.36/1,972.65
  6. Step 6: Final answer
    x = 1,979.87

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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.