Home / 1,679.90-2,319.18-1,287.68

Finding the Fourth Proportional to 1,679.90, 2,319.18 and 1,287.68

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Solution

The fourth proportional to 1,679.90, 2,319.18 and 1,287.68 is: 1,777.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.90 : 2,319.18 = 1,287.68 : x
  2. Step 2: Convert to fraction form
    1,679.90/2,319.18 = 1,287.68/x
  3. Step 3: Cross multiply
    1,679.90x = 2,319.18 × 1,287.68
  4. Step 4: Simplify right side
    1,679.90x = 2,986,361.70
  5. Step 5: Solve for x
    x = 2,986,361.70/1,679.90
  6. Step 6: Final answer
    x = 1,777.70

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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.