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Finding the Fourth Proportional to 785.93, 1,179.45 and 439.55

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Solution

The fourth proportional to 785.93, 1,179.45 and 439.55 is: 659.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.93 : 1,179.45 = 439.55 : x
  2. Step 2: Convert to fraction form
    785.93/1,179.45 = 439.55/x
  3. Step 3: Cross multiply
    785.93x = 1,179.45 × 439.55
  4. Step 4: Simplify right side
    785.93x = 518,419.15
  5. Step 5: Solve for x
    x = 518,419.15/785.93
  6. Step 6: Final answer
    x = 659.63

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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.