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Finding the Third Proportional to 255.66 and 407.53

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Solution

The third proportional to 255.66 and 407.53 is: 649.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.66 : 407.53 = 407.53 : x
  2. Step 2: Convert to fraction form
    255.66/407.53 = 407.53/x
  3. Step 3: Cross multiply
    255.66x = 407.53 × 407.53
  4. Step 4: Simplify right side
    255.66x = 166,081.72
  5. Step 5: Solve for x
    x = 166,081.72/255.66
  6. Step 6: Final answer
    x = 649.63

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.