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Finding the Fourth Proportional to 782.67, 1,173.51 and 386.85

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Solution

The fourth proportional to 782.67, 1,173.51 and 386.85 is: 580.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.67 : 1,173.51 = 386.85 : x
  2. Step 2: Convert to fraction form
    782.67/1,173.51 = 386.85/x
  3. Step 3: Cross multiply
    782.67x = 1,173.51 × 386.85
  4. Step 4: Simplify right side
    782.67x = 453,972.34
  5. Step 5: Solve for x
    x = 453,972.34/782.67
  6. Step 6: Final answer
    x = 580.03

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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.