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Finding the Fourth Proportional to 785.76, 1,081.88 and 667.49

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Solution

The fourth proportional to 785.76, 1,081.88 and 667.49 is: 919.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.76 : 1,081.88 = 667.49 : x
  2. Step 2: Convert to fraction form
    785.76/1,081.88 = 667.49/x
  3. Step 3: Cross multiply
    785.76x = 1,081.88 × 667.49
  4. Step 4: Simplify right side
    785.76x = 722,138.67
  5. Step 5: Solve for x
    x = 722,138.67/785.76
  6. Step 6: Final answer
    x = 919.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.