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Finding the Fourth Proportional to 770.31, 1,148.92 and 721.71

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Solution

The fourth proportional to 770.31, 1,148.92 and 721.71 is: 1,076.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.31 : 1,148.92 = 721.71 : x
  2. Step 2: Convert to fraction form
    770.31/1,148.92 = 721.71/x
  3. Step 3: Cross multiply
    770.31x = 1,148.92 × 721.71
  4. Step 4: Simplify right side
    770.31x = 829,185.25
  5. Step 5: Solve for x
    x = 829,185.25/770.31
  6. Step 6: Final answer
    x = 1,076.43

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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.