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Finding the Fourth Proportional to 764.33, 1,046.87 and 719.45

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Solution

The fourth proportional to 764.33, 1,046.87 and 719.45 is: 985.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.33 : 1,046.87 = 719.45 : x
  2. Step 2: Convert to fraction form
    764.33/1,046.87 = 719.45/x
  3. Step 3: Cross multiply
    764.33x = 1,046.87 × 719.45
  4. Step 4: Simplify right side
    764.33x = 753,173.30
  5. Step 5: Solve for x
    x = 753,173.30/764.33
  6. Step 6: Final answer
    x = 985.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.