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Finding the Fourth Proportional to 768.15, 1,151.55 and 686.14

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Solution

The fourth proportional to 768.15, 1,151.55 and 686.14 is: 1,028.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.15 : 1,151.55 = 686.14 : x
  2. Step 2: Convert to fraction form
    768.15/1,151.55 = 686.14/x
  3. Step 3: Cross multiply
    768.15x = 1,151.55 × 686.14
  4. Step 4: Simplify right side
    768.15x = 790,121.64
  5. Step 5: Solve for x
    x = 790,121.64/768.15
  6. Step 6: Final answer
    x = 1,028.60

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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.