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Finding the Fourth Proportional to 2,145.71, 3,218.43 and 829.20

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Solution

The fourth proportional to 2,145.71, 3,218.43 and 829.20 is: 1,243.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.71 : 3,218.43 = 829.20 : x
  2. Step 2: Convert to fraction form
    2,145.71/3,218.43 = 829.20/x
  3. Step 3: Cross multiply
    2,145.71x = 3,218.43 × 829.20
  4. Step 4: Simplify right side
    2,145.71x = 2,668,722.16
  5. Step 5: Solve for x
    x = 2,668,722.16/2,145.71
  6. Step 6: Final answer
    x = 1,243.75

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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.