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Finding the Fourth Proportional to 785.99, 1,178.33 and 613.42

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Solution

The fourth proportional to 785.99, 1,178.33 and 613.42 is: 919.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.99 : 1,178.33 = 613.42 : x
  2. Step 2: Convert to fraction form
    785.99/1,178.33 = 613.42/x
  3. Step 3: Cross multiply
    785.99x = 1,178.33 × 613.42
  4. Step 4: Simplify right side
    785.99x = 722,811.19
  5. Step 5: Solve for x
    x = 722,811.19/785.99
  6. Step 6: Final answer
    x = 919.62

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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.