Home / 3,421.38-5,128.83-1,689.06

Finding the Fourth Proportional to 3,421.38, 5,128.83 and 1,689.06

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Solution

The fourth proportional to 3,421.38, 5,128.83 and 1,689.06 is: 2,531.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.38 : 5,128.83 = 1,689.06 : x
  2. Step 2: Convert to fraction form
    3,421.38/5,128.83 = 1,689.06/x
  3. Step 3: Cross multiply
    3,421.38x = 5,128.83 × 1,689.06
  4. Step 4: Simplify right side
    3,421.38x = 8,662,901.60
  5. Step 5: Solve for x
    x = 8,662,901.60/3,421.38
  6. Step 6: Final answer
    x = 2,531.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.