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Finding the Fourth Proportional to 686.04, 1,028.76 and 339.18

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Solution

The fourth proportional to 686.04, 1,028.76 and 339.18 is: 508.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.04 : 1,028.76 = 339.18 : x
  2. Step 2: Convert to fraction form
    686.04/1,028.76 = 339.18/x
  3. Step 3: Cross multiply
    686.04x = 1,028.76 × 339.18
  4. Step 4: Simplify right side
    686.04x = 348,934.82
  5. Step 5: Solve for x
    x = 348,934.82/686.04
  6. Step 6: Final answer
    x = 508.62

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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.