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Finding the Fourth Proportional to 686.00, 1,028.68 and 252.86

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Solution

The fourth proportional to 686.00, 1,028.68 and 252.86 is: 379.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.00 : 1,028.68 = 252.86 : x
  2. Step 2: Convert to fraction form
    686.00/1,028.68 = 252.86/x
  3. Step 3: Cross multiply
    686.00x = 1,028.68 × 252.86
  4. Step 4: Simplify right side
    686.00x = 260,106.25
  5. Step 5: Solve for x
    x = 260,106.25/686.00
  6. Step 6: Final answer
    x = 379.16

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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.