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Finding the Fourth Proportional to 782.69, 1,173.26 and 436.19

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Solution

The fourth proportional to 782.69, 1,173.26 and 436.19 is: 653.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.69 : 1,173.26 = 436.19 : x
  2. Step 2: Convert to fraction form
    782.69/1,173.26 = 436.19/x
  3. Step 3: Cross multiply
    782.69x = 1,173.26 × 436.19
  4. Step 4: Simplify right side
    782.69x = 511,763.99
  5. Step 5: Solve for x
    x = 511,763.99/782.69
  6. Step 6: Final answer
    x = 653.85

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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.