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Finding the Fourth Proportional to 1,673.28, 2,509.21 and 685.42

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Solution

The fourth proportional to 1,673.28, 2,509.21 and 685.42 is: 1,027.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,673.28 : 2,509.21 = 685.42 : x
  2. Step 2: Convert to fraction form
    1,673.28/2,509.21 = 685.42/x
  3. Step 3: Cross multiply
    1,673.28x = 2,509.21 × 685.42
  4. Step 4: Simplify right side
    1,673.28x = 1,719,862.72
  5. Step 5: Solve for x
    x = 1,719,862.72/1,673.28
  6. Step 6: Final answer
    x = 1,027.84

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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.