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Finding the Fourth Proportional to 785.30, 1,179.36 and 511.92

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Solution

The fourth proportional to 785.30, 1,179.36 and 511.92 is: 768.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.30 : 1,179.36 = 511.92 : x
  2. Step 2: Convert to fraction form
    785.30/1,179.36 = 511.92/x
  3. Step 3: Cross multiply
    785.30x = 1,179.36 × 511.92
  4. Step 4: Simplify right side
    785.30x = 603,737.97
  5. Step 5: Solve for x
    x = 603,737.97/785.30
  6. Step 6: Final answer
    x = 768.80

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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.