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Finding the Fourth Proportional to 782.58, 1,179.76 and 729.74

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Solution

The fourth proportional to 782.58, 1,179.76 and 729.74 is: 1,100.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.58 : 1,179.76 = 729.74 : x
  2. Step 2: Convert to fraction form
    782.58/1,179.76 = 729.74/x
  3. Step 3: Cross multiply
    782.58x = 1,179.76 × 729.74
  4. Step 4: Simplify right side
    782.58x = 860,918.06
  5. Step 5: Solve for x
    x = 860,918.06/782.58
  6. Step 6: Final answer
    x = 1,100.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.