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Finding the Fourth Proportional to 785.61, 1,178.42 and 272.49

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Solution

The fourth proportional to 785.61, 1,178.42 and 272.49 is: 408.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.61 : 1,178.42 = 272.49 : x
  2. Step 2: Convert to fraction form
    785.61/1,178.42 = 272.49/x
  3. Step 3: Cross multiply
    785.61x = 1,178.42 × 272.49
  4. Step 4: Simplify right side
    785.61x = 321,107.67
  5. Step 5: Solve for x
    x = 321,107.67/785.61
  6. Step 6: Final answer
    x = 408.74

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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.