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Finding the Fourth Proportional to 765.92, 1,148.93 and 218.09

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Solution

The fourth proportional to 765.92, 1,148.93 and 218.09 is: 327.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.92 : 1,148.93 = 218.09 : x
  2. Step 2: Convert to fraction form
    765.92/1,148.93 = 218.09/x
  3. Step 3: Cross multiply
    765.92x = 1,148.93 × 218.09
  4. Step 4: Simplify right side
    765.92x = 250,563.31
  5. Step 5: Solve for x
    x = 250,563.31/765.92
  6. Step 6: Final answer
    x = 327.14

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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.