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Finding the Fourth Proportional to 959.72, 1,438.14 and 686.39

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Solution

The fourth proportional to 959.72, 1,438.14 and 686.39 is: 1,028.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.72 : 1,438.14 = 686.39 : x
  2. Step 2: Convert to fraction form
    959.72/1,438.14 = 686.39/x
  3. Step 3: Cross multiply
    959.72x = 1,438.14 × 686.39
  4. Step 4: Simplify right side
    959.72x = 987,124.91
  5. Step 5: Solve for x
    x = 987,124.91/959.72
  6. Step 6: Final answer
    x = 1,028.56

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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.