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Finding the Fourth Proportional to 785.79, 1,178.28 and 539.37

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Solution

The fourth proportional to 785.79, 1,178.28 and 539.37 is: 808.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.79 : 1,178.28 = 539.37 : x
  2. Step 2: Convert to fraction form
    785.79/1,178.28 = 539.37/x
  3. Step 3: Cross multiply
    785.79x = 1,178.28 × 539.37
  4. Step 4: Simplify right side
    785.79x = 635,528.88
  5. Step 5: Solve for x
    x = 635,528.88/785.79
  6. Step 6: Final answer
    x = 808.78

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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.