Home / 1,687.95-2,329.38-979.94

Finding the Fourth Proportional to 1,687.95, 2,329.38 and 979.94

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Solution

The fourth proportional to 1,687.95, 2,329.38 and 979.94 is: 1,352.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.95 : 2,329.38 = 979.94 : x
  2. Step 2: Convert to fraction form
    1,687.95/2,329.38 = 979.94/x
  3. Step 3: Cross multiply
    1,687.95x = 2,329.38 × 979.94
  4. Step 4: Simplify right side
    1,687.95x = 2,282,658.46
  5. Step 5: Solve for x
    x = 2,282,658.46/1,687.95
  6. Step 6: Final answer
    x = 1,352.33

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1.5x scale

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.