Home / 1,986.31-2,966.09-1,621.81

Finding the Fourth Proportional to 1,986.31, 2,966.09 and 1,621.81

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Solution

The fourth proportional to 1,986.31, 2,966.09 and 1,621.81 is: 2,421.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.31 : 2,966.09 = 1,621.81 : x
  2. Step 2: Convert to fraction form
    1,986.31/2,966.09 = 1,621.81/x
  3. Step 3: Cross multiply
    1,986.31x = 2,966.09 × 1,621.81
  4. Step 4: Simplify right side
    1,986.31x = 4,810,434.42
  5. Step 5: Solve for x
    x = 4,810,434.42/1,986.31
  6. Step 6: Final answer
    x = 2,421.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.