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Finding the Fourth Proportional to 765.44, 1,147.29 and 436.56

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Solution

The fourth proportional to 765.44, 1,147.29 and 436.56 is: 654.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.44 : 1,147.29 = 436.56 : x
  2. Step 2: Convert to fraction form
    765.44/1,147.29 = 436.56/x
  3. Step 3: Cross multiply
    765.44x = 1,147.29 × 436.56
  4. Step 4: Simplify right side
    765.44x = 500,863.89
  5. Step 5: Solve for x
    x = 500,863.89/765.44
  6. Step 6: Final answer
    x = 654.34

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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.