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Finding the Fourth Proportional to 686.28, 1,028.94 and 339.19

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Solution

The fourth proportional to 686.28, 1,028.94 and 339.19 is: 508.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.28 : 1,028.94 = 339.19 : x
  2. Step 2: Convert to fraction form
    686.28/1,028.94 = 339.19/x
  3. Step 3: Cross multiply
    686.28x = 1,028.94 × 339.19
  4. Step 4: Simplify right side
    686.28x = 349,006.16
  5. Step 5: Solve for x
    x = 349,006.16/686.28
  6. Step 6: Final answer
    x = 508.55

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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.