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Finding the Fourth Proportional to 768.88, 1,146.63 and 725.75

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Solution

The fourth proportional to 768.88, 1,146.63 and 725.75 is: 1,082.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.88 : 1,146.63 = 725.75 : x
  2. Step 2: Convert to fraction form
    768.88/1,146.63 = 725.75/x
  3. Step 3: Cross multiply
    768.88x = 1,146.63 × 725.75
  4. Step 4: Simplify right side
    768.88x = 832,166.72
  5. Step 5: Solve for x
    x = 832,166.72/768.88
  6. Step 6: Final answer
    x = 1,082.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.