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Finding the Fourth Proportional to 768.45, 1,149.93 and 615.36

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Solution

The fourth proportional to 768.45, 1,149.93 and 615.36 is: 920.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.45 : 1,149.93 = 615.36 : x
  2. Step 2: Convert to fraction form
    768.45/1,149.93 = 615.36/x
  3. Step 3: Cross multiply
    768.45x = 1,149.93 × 615.36
  4. Step 4: Simplify right side
    768.45x = 707,620.92
  5. Step 5: Solve for x
    x = 707,620.92/768.45
  6. Step 6: Final answer
    x = 920.84

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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.