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Finding the Fourth Proportional to 785.73, 1,172.86 and 728.63

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Solution

The fourth proportional to 785.73, 1,172.86 and 728.63 is: 1,087.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.73 : 1,172.86 = 728.63 : x
  2. Step 2: Convert to fraction form
    785.73/1,172.86 = 728.63/x
  3. Step 3: Cross multiply
    785.73x = 1,172.86 × 728.63
  4. Step 4: Simplify right side
    785.73x = 854,580.98
  5. Step 5: Solve for x
    x = 854,580.98/785.73
  6. Step 6: Final answer
    x = 1,087.63

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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.