Home / 1,678.20-2,314.14-1,087.68

Finding the Fourth Proportional to 1,678.20, 2,314.14 and 1,087.68

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Solution

The fourth proportional to 1,678.20, 2,314.14 and 1,087.68 is: 1,499.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.20 : 2,314.14 = 1,087.68 : x
  2. Step 2: Convert to fraction form
    1,678.20/2,314.14 = 1,087.68/x
  3. Step 3: Cross multiply
    1,678.20x = 2,314.14 × 1,087.68
  4. Step 4: Simplify right side
    1,678.20x = 2,517,043.80
  5. Step 5: Solve for x
    x = 2,517,043.80/1,678.20
  6. Step 6: Final answer
    x = 1,499.85

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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.