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Finding the Fourth Proportional to 770.26, 1,063.46 and 687.23

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Solution

The fourth proportional to 770.26, 1,063.46 and 687.23 is: 948.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.26 : 1,063.46 = 687.23 : x
  2. Step 2: Convert to fraction form
    770.26/1,063.46 = 687.23/x
  3. Step 3: Cross multiply
    770.26x = 1,063.46 × 687.23
  4. Step 4: Simplify right side
    770.26x = 730,837.56
  5. Step 5: Solve for x
    x = 730,837.56/770.26
  6. Step 6: Final answer
    x = 948.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.