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Finding the Fourth Proportional to 506.72, 764.42 and 491.60

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Solution

The fourth proportional to 506.72, 764.42 and 491.60 is: 741.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    506.72 : 764.42 = 491.60 : x
  2. Step 2: Convert to fraction form
    506.72/764.42 = 491.60/x
  3. Step 3: Cross multiply
    506.72x = 764.42 × 491.60
  4. Step 4: Simplify right side
    506.72x = 375,788.87
  5. Step 5: Solve for x
    x = 375,788.87/506.72
  6. Step 6: Final answer
    x = 741.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.