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Finding the Fourth Proportional to 686.04, 1,028.40 and 571.42

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Solution

The fourth proportional to 686.04, 1,028.40 and 571.42 is: 856.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.04 : 1,028.40 = 571.42 : x
  2. Step 2: Convert to fraction form
    686.04/1,028.40 = 571.42/x
  3. Step 3: Cross multiply
    686.04x = 1,028.40 × 571.42
  4. Step 4: Simplify right side
    686.04x = 587,648.33
  5. Step 5: Solve for x
    x = 587,648.33/686.04
  6. Step 6: Final answer
    x = 856.58

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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.