Home / 1,687.64-2,329.23-979.92

Finding the Fourth Proportional to 1,687.64, 2,329.23 and 979.92

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Solution

The fourth proportional to 1,687.64, 2,329.23 and 979.92 is: 1,352.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.64 : 2,329.23 = 979.92 : x
  2. Step 2: Convert to fraction form
    1,687.64/2,329.23 = 979.92/x
  3. Step 3: Cross multiply
    1,687.64x = 2,329.23 × 979.92
  4. Step 4: Simplify right side
    1,687.64x = 2,282,459.06
  5. Step 5: Solve for x
    x = 2,282,459.06/1,687.64
  6. Step 6: Final answer
    x = 1,352.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.