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Finding the Fourth Proportional to 686.38, 1,028.94 and 253.12

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Solution

The fourth proportional to 686.38, 1,028.94 and 253.12 is: 379.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.38 : 1,028.94 = 253.12 : x
  2. Step 2: Convert to fraction form
    686.38/1,028.94 = 253.12/x
  3. Step 3: Cross multiply
    686.38x = 1,028.94 × 253.12
  4. Step 4: Simplify right side
    686.38x = 260,445.29
  5. Step 5: Solve for x
    x = 260,445.29/686.38
  6. Step 6: Final answer
    x = 379.45

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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.