Home / 1,678.90-2,317.80-1,286.68

Finding the Fourth Proportional to 1,678.90, 2,317.80 and 1,286.68

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Solution

The fourth proportional to 1,678.90, 2,317.80 and 1,286.68 is: 1,776.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.90 : 2,317.80 = 1,286.68 : x
  2. Step 2: Convert to fraction form
    1,678.90/2,317.80 = 1,286.68/x
  3. Step 3: Cross multiply
    1,678.90x = 2,317.80 × 1,286.68
  4. Step 4: Simplify right side
    1,678.90x = 2,982,266.90
  5. Step 5: Solve for x
    x = 2,982,266.90/1,678.90
  6. Step 6: Final answer
    x = 1,776.32

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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.