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Finding the Fourth Proportional to 511.53, 764.11 and 438.63

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Solution

The fourth proportional to 511.53, 764.11 and 438.63 is: 655.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.53 : 764.11 = 438.63 : x
  2. Step 2: Convert to fraction form
    511.53/764.11 = 438.63/x
  3. Step 3: Cross multiply
    511.53x = 764.11 × 438.63
  4. Step 4: Simplify right side
    511.53x = 335,160.47
  5. Step 5: Solve for x
    x = 335,160.47/511.53
  6. Step 6: Final answer
    x = 655.21

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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.